PDA

View Full Version : Which Motor Oil Do you Prefer?



Megafast13
Jul 8th, 2009, 05:54 PM
Which motor oil do you most frequently change your car with?

PuDeN
Jul 8th, 2009, 06:19 PM
I use Petronas Synthium 1000 15W 50 fully synthetic for my 1.6 10 year old engine.

ricks778
Jul 8th, 2009, 06:58 PM
Well, I have never pulled an engine apart to look at what happens inside after using a particular kind of oil for a few years. However, after my first second oil change on my brand new Toyota Tacoma I switched to Castrol Syntec full synthetic plus a Lubegard additive for the engine oil.
I used to pull a long hill going to work each day and before the oil change, my truck would shift out of overdrive before reaching the top of that hill. After changing the oil and putting the additive in the engine it would stay in overdrive all the up to the top of the hill. Indicating to me, it had either more horsepower, or less friction.

AeroCleanse
Jul 8th, 2009, 07:20 PM
I only use Amsoil

Lt1Corvette
Jul 8th, 2009, 07:28 PM
Depends. I use Castrol in one Car, Redline in another, Mobil in the others.

Honda Fit
Jul 8th, 2009, 07:31 PM
I use Pennzoil Platinum Synthetic 5w20 b/c it's cheap for a 5 quart jug at Walmart ($20).

Trojan fan
Jul 8th, 2009, 08:01 PM
mobil 1 at wally world is only 2 bucks more ($22)for the 5 quart jug..... that's what I employ.

H.E.D
Jul 8th, 2009, 08:15 PM
Royal Purple 10w-40 And A K&N Oil Filter For Me... If Not Available I Go With Mobil 1.

TimG
Jul 8th, 2009, 08:32 PM
mobil 1. been using them on almost all my cars for more then 10 years.

Andy M.
Jul 8th, 2009, 08:48 PM
The only thing that goes in the SS is Mobile1! And yes I do race her.

Andy

J. A. Michaels
Jul 9th, 2009, 02:19 AM
Quaker State for me.

harshest
Jul 9th, 2009, 04:11 AM
Pennzoil Platinum 5/30 in both my Tacoma and Explorer. I am not really sure why but I have always used Pennzoil.

Piku
Jul 9th, 2009, 06:24 AM
Mobil 1 Synthetic 0W-40

It is one of the VW approved oils.

zeegs
Jul 9th, 2009, 07:43 AM
Royal Purple for me in the engine, transfer case, and rears.

02zx9r
Jul 9th, 2009, 08:28 AM
Pennzoil Platinum is a great oil. Pennzoil yellow bottle is excellent for 5K intervals. Amsoil *I* think is the better of the long drain interval oils.

Really cant go wrong with any of todays oils. Any SM oil will get you 5K/6 month intervals, which is the new 3K/3month routine

Nappers
Jul 9th, 2009, 08:39 AM
Mobil 1 and Wix/Napa Gold filters every 5,000 miles (easy to remember to change!) have just over 140,000 miles on the Yukon and approaching 70,000 miles on the Neon.

Malo83
Jul 9th, 2009, 10:39 AM
Pennzoil Platinum 5W30 and WIX filters :xyxthumbs

TimG
Jul 9th, 2009, 03:37 PM
For the first time in 10 years I bought Shell Ultra Helix (grey tub) last night. Maybe the counter girl got something to do with it. LOL

Ryan L.
Jul 10th, 2009, 09:23 PM
All Mobil 1 and Amsoil here....

Jeep gets all Amsoil oils and lubricants beside motor oil and thats Mobil 1 Synthetic SUV.

Ryan

Need4racin
Jul 11th, 2009, 09:44 AM
Motorcraft oil and filter.

roushstage2
Jul 11th, 2009, 05:57 PM
Hard to say, lol.

Amsoil SSO, Royal Purple, Motorcraft Syn Blend, Pennzoil Platinum, Valvoline MaxLife, SuperTech...

PuDeN
Jul 12th, 2009, 12:15 AM
I just saw this in youtube. http://www.youtube.com/watch?v=KEj-VMwgz3U. Is that motor oil that good? Never seen one here at my place.

Malo83
Jul 12th, 2009, 11:03 AM
Reminded me of one of those Slick 50 commercials :chuckle1

CumminsCrazed
Sep 7th, 2009, 07:34 AM
Amsoil only

Calais
Sep 7th, 2009, 07:41 AM
I use Castrol GTX.

Ganesa
Sep 7th, 2009, 08:01 AM
I use FK Massimo Pulse RS 10w40 or Freshing 5w35....

I also use Mobil 1 on my other cars. :]

but I think frequent oil change, is easy car care for the engine :D :D

Paul S
Sep 7th, 2009, 08:09 AM
Shell Rotella in the diesel F-250 , Mobil 1 in the firebird , Castrol in the daily drivers.

Paul S

jfelbab
Sep 7th, 2009, 12:58 PM
Pennzoil Platinum. Great oil at decent price.

FWIW, there currently is a Pennzoil $15 rebate on 5 quarts of Penzoil Platinum in effect until the end of November. 5 quart jug at Walmart is $20 less the $15 rebate results in a buck a quart.

Good source of data on oil: www.BITOG.com

Jossy92
Sep 7th, 2009, 03:41 PM
Mobil one in my 88 Honda, once a year, every year, for 22 years.
260,000 miles.

79elcamino
Sep 7th, 2009, 06:41 PM
i use royal purple with a royal purple oil filter in both my nissan maxima and el camino

hacker-pschorr
Sep 13th, 2009, 12:59 PM
Daily Drivers - Mobil 1 (will be switching to Brad Penn next change cycle)
Supercharged Porsche 928 - Valvoline VR1 20w-50
Replica cobra - Royal Purple
Porsche 928 track car - Redline
Ferrari 355 - Redline

boiler7904
Sep 16th, 2009, 06:47 PM
Mobil 1 and Wix/Napa Gold filters every 5,000 miles (easy to remember to change!) have just over 140,000 miles on the Yukon and approaching 70,000 miles on the Neon.

I'm on the same system with my Colorado which means an oil change every 6-7 weeks. Truck hit 111,111 on monday. Need to put my wife's Escape on the same program soon - probably at the 90,000 mark.

I usually order my filters online to save a few bucks and get the oil at Wal-Mart. Between their low price and the Mobil 1 Rewards program, I can do a complete 6 qt oil change for under $35. Local quick lube place wants $50+ for Valvoline semi-synthetic.

Axles and transfer case on the truck are filled with Amsoil.

the_invisible
Sep 16th, 2009, 10:34 PM
The Rotella T Synethic oil line is very impressive. Due to its higher viscosity, the car feels like it lost a couple of horse power in the lower range of the powerband (yes I can feel the power loss in a race). It has the best protection in its price range according to oil analysis tests.

Royal Purple and Redline are the ideal choice for race cars, in my opinion.

Though, the oil for my daily driver is Mobil 1 Synthetic. It is the cheapest "mediocre quality" oil out there.

Also, there is a difference between "Full Synthetic" and "100% synthetic".

visaliaipa
Sep 16th, 2009, 11:29 PM
Whatever the dealer puts in my Dodge Cummins. I think they use Rotella but not sure. I just know it takes like 16 quarts.........

Eddie6th
Sep 18th, 2009, 04:33 PM
I use Redline 10/40 road,not race. Good stuff. Another good option is Bardahl XTC range with fullerene. Redline also make a lot of other good products. Water Wetter is good for the coolant system and the range of Si injector cleaners is good.

(The only Mobil1 synthetic available in europe is 0/40.)

79elcamino
Sep 18th, 2009, 09:57 PM
what is the difference between full and 100%??

the_invisible
Sep 18th, 2009, 11:25 PM
What? you guys only have the 0W40 weight oil? That's a wide range of viscosity, suitable for many applications... but that is barely enough to meet OEM standards for a specific weight. I guess you guys don't have the ULEV standard either, right?

I am not sure the specifics about full vs 100%. A user by the name of roadrage on the s2k board mentions something that full synthetic has replaced 100% synthetic oil for cost. The term Full Synthetic is a veil to hide the fact that the oil is not 100% synthetic.

High-end oils like Redline, Amsoil, Royal Purple are pretty much 100% synthetic. Amsoil boldly claims that their oil is 100% synthetic, while Mobil1 and others do not. I find it surprising that Redline no longer advertises its oil as "100% synthetic". That makes me wonder if they have degraded their products.

Eddie6th
Sep 19th, 2009, 08:04 PM
It's only Mobil1 that doesn't supply anything other than 0/40. Okay for more modern vehicles. I prefer to stick with 10/40 for my '93 civic.

I've got a couple of containers of recently bought Redline. I'll check what it says.

AceM3
Sep 22nd, 2009, 10:35 PM
I use Kendal GT1
Full Synthetic on the M3

And Castrol GTX HM on the ladys E36

Both have seen Track/ spirited driving... M3 has done more haha ;)

3Fitty
Sep 23rd, 2009, 05:42 AM
Amsoil.

roushstage2
Oct 5th, 2009, 10:24 PM
High-end oils like Redline, Amsoil, Royal Purple are pretty much 100% synthetic. Amsoil boldly claims that their oil is 100% synthetic, while Mobil1 and others do not. I find it surprising that Redline no longer advertises its oil as "100% synthetic". That makes me wonder if they have degraded their products.
Amsoil and RP are group IV oils, and are true synthetics. Redline is actually a group V oil, which is ester based and also a true synthetic. Group V is the peak of the mountain, and you pay for it. Mobil1 is pretty much a group III, which is a hydrocracked oil (the lowest grade "true" synthetic). Pennzoil Platinum is a group III which costs less than Mobil1, but performs better. If any of the above have "degraded," it's Mobil1.

Bigmerc2003
Oct 6th, 2009, 06:35 AM
Motorcraft oil and filter.

Same here, Motorcraft in the fords or Mobil 1 in the truck:xyxthumbs

Wolf-Strong
Oct 6th, 2009, 10:46 AM
200,000 on my BMW 5 series running the basic Castrol GTX changed every 4-5,000 miles. Well actually it's BMW 15w40 but reality is that it is just rebranded. $2.89/quart and the car runs like a dream! That is just a regular old mineral oil, but a good quality one.

My favorite oil though is Royal Purple, but I just can't justify using it when the $3/qt oil works just fine for an old beater. If I owned a dream car of mine though, it would get Royal Purple all day long.

zaidgreat
Oct 6th, 2009, 06:51 PM
I use Petronas Synthium 1000 15W 50 fully synthetic for my 1.6 10 year old engine.

Good for you... I'm using Prestone 5w40/5w50 and Liqui-moly for the past six years.
Car has been running 110k km smoothly....

reasoned
Oct 26th, 2009, 05:45 PM
I use Castrol Edge, Mobile 1, and Castrol Syntec. All 3 have been good oils.

captaincog
Oct 27th, 2009, 08:31 PM
I have used Mobil 1 for many years now. I have tried other oils, inlcuding Amsoil, but I usually stick to Mobil 1.

Lexus Guy04
Oct 29th, 2009, 11:51 AM
Castol Edge here, started using it 10k ago.

Fly Bye
Nov 4th, 2009, 03:14 PM
This is what I use yo



http://images.plumgoodfood.com/images/Kristin/mainstream/lg/720.jpg

Grime Busters
Nov 4th, 2009, 07:51 PM
Amsoil, hands down. In all my equipment, motorcycles, cars, trucks. The original 100% synthetic oil.

hmeister
Nov 4th, 2009, 08:00 PM
Our engineers had to do a cost and eval on synthetic and I was told by them that Mobil1 has the most consistant size of the oil molecules.
More uniform molecules = less friction. Inconsistent molecule size = more friction. This is something some other synthetic oils do not have..
This has been confirmed by independent labs as well as ExxonMobile.

H.

speed3blackmica
Nov 5th, 2009, 04:43 PM
i use royal purple 5w30 motor oil for the engine and max gear 75w90 for the transaxle..only stuff ill use

roushstage2
Nov 6th, 2009, 10:51 AM
Our engineers had to do a cost and eval on synthetic and I was told by them that Mobil1 has the most consistant size of the oil molecules.
More uniform molecules = less friction. Inconsistent molecule size = more friction. This is something some other synthetic oils do not have..
This has been confirmed by independent labs as well as ExxonMobile.

H.
Of course the oil maker confirmed it. What oils did they compare against? I'd be interesting in hearing this because I can tell you when UOA's are performed, Mobil1 is not at the top. Just to re-iterate before someone loses it (for some reason, you say anything even potentially negative about M1, and people who use it go crazy), I am NOT saying Mobil1 is bad, but that it is NOT the best oil out there.

hmeister
Nov 6th, 2009, 11:39 AM
Of course the oil maker confirmed it. What oils did they compare against? I'd be interesting in hearing this because I can tell you when UOA's are performed, Mobil1 is not at the top. Just to re-iterate before someone loses it (for some reason, you say anything even potentially negative about M1, and people who use it go crazy), I am NOT saying Mobil1 is bad, but that it is NOT the best oil out there.
Yes your correct about a forum, I don't want to stir the pot around here and get someone cranky...

Sorry, I don't know about what others they tested against but that it was explained to us about the consistant size. (this is part of M1's PR stuff and they advertise this) Of course in the discussion Castrol came up and it was noted that Castrol does not have the same consistancy as M1. That may not even mean anything when I discussed this with another engineer I work with and this was discussed as well.

I don't have a preference regarding syn oil as I am still using regular oil in my 97 Continental...

H.

Autobrite
Nov 18th, 2009, 05:22 PM
I use Lucas synthetics in everything I own. From my truck to my dirtbike. Kinda hard to pass it up when I sell it at work. lol

andyo
Dec 18th, 2009, 08:24 AM
mobil 1 or castrol syntec 0w30 with zddplus which ever is on sale at the time.

the_invisible
Dec 19th, 2009, 12:49 AM
Good choice.

The Castrol Syntec 0w30 is an exceptional oil and is nothing like the other Castrol Syntec oil of different weights. The Castrol Syntec 0w30 is in a league of its own. The difference is more than just weight... it is far superior to the 5w30. The weight may appear light, but its lubrication and protection is more similar to 10w40.

If your car requires 5w30 synthetic oil, 0w30 Castrol Syntec will be an ideal choice.

9C1 MAN
Dec 19th, 2009, 04:56 PM
Amsoil only. For my 86 pontiac also 06 charger rt.

maxepr1
Dec 20th, 2009, 08:57 AM
Motul for me. Ever since Mobil 1 went cheap and call themselve's synthetic, don't waste your money!! Not even considered syn. anymore!! And they raised the price at that!!! Motul ATF for me went from adding about a quart every 4000 miles to adding no oil!!! Truck has actually stopped burning oil and runs smoother. Don't hear lifters during start-up. And the best part is it's the same cost as MOBIL 1 !! And it is a true synthetic!!

SSMUFF
Feb 22nd, 2010, 11:59 AM
Castrol because it is liquid engineering.

05ram25004x4
Feb 24th, 2010, 09:25 AM
Chevron Delo400

roushstage2
Feb 24th, 2010, 01:20 PM
Good stuff right there! ^^^

Anyone in the Sac area find some Pennzoil Ultra yet?

Fly Bye
Mar 24th, 2010, 09:14 PM
I use Wesson oil yo.

2010V8Colorado
Mar 31st, 2010, 02:01 AM
Royal Purple 5W30. Tried Mobil 1 and had the lifter ticking noise. Engine is noticeably quieter with RP.

Shizane2002
Jun 4th, 2010, 01:09 PM
Mobile 1 FTW!!!

alnp
Jul 5th, 2010, 08:44 AM
Mobil 1 only. I have tried Castrol and Valvoline's best synthetic; they both burn off faster than Mobil 1. I also use the original Slick 50 (not today's trash) which is called Lubrilon. It definitely works.

Bill Davidson
Aug 1st, 2010, 02:57 PM
I use Castrol Synthetic in my truck. It's not necessarily my brand preference. If I get 4 oil changes done with it the 5th is free. I have an oil quality meter on my '09 GMC, I get about 6,000 miles between oil changes.

I use Mobil1 in my '80 Camaro (350 ci crate engine).

I use Bel-Ray semi-synthetic in my 2000 Suzuki Bandit 1200cc motorcycle, a full synthetic will lead to clutch slippage without upgrading the clutch springs. Too much power, too little clutch :-).

roushstage2
Aug 1st, 2010, 03:13 PM
Those OCI meters are pretty accurate, but are also calibrated for conventional oil, not synthetics. If you or anyone who reads this goes for extended drains, you may want to have it actually analyzed and see what shows up since you could be draining oil that still has some life left on it. Then again, where you are located, it might be better just to change it "on time" anyways. Just blabbing out loud...

Bill Davidson
Sep 26th, 2010, 01:33 PM
Those OCI meters are pretty accurate, but are also calibrated for conventional oil, not synthetics. If you or anyone who reads this goes for extended drains, you may want to have it actually analyzed and see what shows up since you could be draining oil that still has some life left on it. Then again, where you are located, it might be better just to change it "on time" anyways. Just blabbing out loud...

I'm not worried about it if I'm currently getting 6,000 miles and I would have traditionally been changing it at 3,000 I'm already getting double what I would have expected.

Synthetic or Dino oil aside oil filters are still oil filters and having them changed out is still beneficial.

Oil changes are the least expensive cost preventive maintenance you can do on a vehicle so I do lots of them. Most part failure is do to lack of, or breakdown of fluids. Even old nearly worn out machinery will normally keep on ticking, as long as it has fresh/full fluid, but you can take a brand new machine and kill it in no time with broken down/contaminated or low fluids.

This is why I'm not as particular about the brand as I am about the routine.

roushstage2
Sep 26th, 2010, 07:14 PM
Dino oil, especially newer ones, can generally go 5,000-7,000 miles in most engines anyways. People have just always bought into the 3,000-mile OCI bit. Some cars have the change oil light or what have you in the dash, and all it does it come on after say, 5,000 miles- the "recommended" service interval. The OCI meter isn't extending the life of oil in any way...

fordf150
Sep 27th, 2010, 04:17 AM
I've used Mobil 1 in the past, but lately I've gone to Valvoline SynPower full synthetic because I can get it on sale for $3.99/quart every now and then at O'Reilly.

SVT Lightning
Oct 12th, 2010, 02:10 PM
I use Wesson oil yo.






After you drain it, does it go in the fryer?

smack
Oct 12th, 2010, 06:48 PM
I use whatever the manufacturer recomends. In my case, that would be Castrol.

jaymz
Oct 13th, 2010, 06:34 AM
I used to use Mobil 1 in my Lightning, but last change I went with Royal Purple. But now the stuff is $8.99/qt at O'Reilly's, and that's just too much. Will be switching to something else.

Jim

therdrman
Feb 9th, 2011, 06:58 PM
any good oil i guess. but royal purple is the best imo. i have castrol in my car right now

STRIFE
Feb 9th, 2011, 09:09 PM
I had Motul in my G35, but this oil is hard to get in my area. I currently have Royal Purple in the G.
In my Prelude it's just reg dino oil...same with my MPV

Jeff Brown
Feb 9th, 2011, 09:54 PM
Redline

klink10
Feb 27th, 2011, 06:10 PM
Amsoil in the car and bikes.

dc2_
Feb 28th, 2011, 12:47 AM
eneos oil

roushstage2
Feb 28th, 2011, 12:08 PM
That's some good stuff too.

Shootist
Mar 1st, 2011, 09:50 AM
Used to be exclusive Mobil 1, then Mobil 1EP, now I use Walmart's synthetic in my older cars with 5K change intervals. An aside, Wally-World's filters are made by Champion Labs and are also excellent values. I would buy them all day over the regular Fram filters.

roushstage2
Mar 1st, 2011, 01:49 PM
SuperTech oil and filters are both quite good, contrary to popular belief. Filters are by Champion and the oil is WPP.

Fly Bye
Jun 4th, 2011, 12:25 PM
Which motor oil do you most frequently change your car with?





I use M1, but I do not change it frequently, as the days of 3k miles, or 3 months is a thing of the past. Motor oil has come a long way in the past 20 years.

I know peeps that have had UOA (used oil analysis) performed on oil's with a wide variety of intervals, including 10k, and even higher milage intervals, and according to the experts in the labratory, (lubrication and friction engineers) a UOA (synthetic) pulled from a 7,500 mile interval, can be shown to still be in very good shape.

I have a sports car in my garage that I do not drive very often, so I base my interval not on milage, but on time. My interval is 9-12 months. Synthetics have the ability to resist oxidation. At three months, a synthetic motor oil won't even be phased, if just chilling inside your crancase, inside your garage. It's has absolutely nothing to do with money, the fact is, there is absolutely no need to change it.

Changing your oil at 3k/3 months is a complete waste of time, energy and valuable resources. These days, just about any name brand motor oil will suffice, as the technology has come that far. I have spoken with experts whom say that even the dino oils are "almost" as good as syn.

I think it comes down to whatever color bottle floats your boat.


Happy motoring :wavey

jfelbab
Jun 4th, 2011, 12:45 PM
I use M1, but I do not change it frequently, as the days of 3k miles, or 3 months is a thing of the past. Motor oil has come a long way in the past 20 years.

I know peeps that have had UOA (used oil analysis) performed on oil's with a wide variety of intervals, including 10k, and even higher milage intervals, and according to the experts in the labratory, (lubrication and friction engineers) a UOA (synthetic) pulled from a 7,500 mile interval, can be shown to still be in very good shape.

I have a sports car in my garage that I do not drive very often, so I base my interval not on milage, but on time. My interval is 9-12 months. Synthetics have the ability to resist oxidation. At three months, a synthetic motor oil won't even be phased, if just chilling inside your crancase, inside your garage. It's has absolutely nothing to do with money, the fact is, there is absolutely no need to change it.

Changing your oil at 3k/3 months is a complete waste of time, energy and valuable resources. These days, just about any name brand motor oil will suffice, as the technology has come that far. I have spoken with experts whom say that even the dino oils are "almost" as good as syn.

I think it comes down to whatever color bottle floats your boat.


Happy motoring :wavey


I have a sports car in my garage as well. It sees maybe 200 miles a year. I change my oil once a year with Pennzoil Platinum. The sports car gets stored for the cold and wet months. I change the oil when I take it out of storage.

I also did the oil testing for my daily driver. I found 7,500/6 months miles to be optimum for oil change interval on my RX330.

3 Months and 3k miles is a ridiculous waste these days.

RS-Kwong
Jun 4th, 2011, 02:00 PM
Motul 0w-30

jezz12
Sep 20th, 2011, 06:47 AM
Eneos Molybdenum semi-syn 10w-40 and honda semi-syn 5w-30 (idemitsu-made in japan)

beamer
Sep 20th, 2011, 08:24 AM
i use mobile 1 in my bmw and in my mitsubishi endevor. 23$ at walmart for 5quarts is cheap. used to use ams oil but i change so often or at least every 3k 0r 5k it doesnt pay to use 10$ a quart oil. and always k@n air and oil filters.

Shootist
Nov 3rd, 2011, 08:13 AM
K&N oil filters (manufactured by Champion Labs) are basically the same as the Mobil 1 oil filter except for the handy socket attachment point on the bottom...excellent filter.
However, I would seriously research the K&N air filter performance online. They have a history of superior airflow but poor filtration.
Many people go to great pains to protect their engines with synthetic oils and premium filters, but then overlook the fact that dirt and abrasives can enter your engine with mediocre filtration. Racing teams will sacrifice filtration for flow, but they tear those engines down frequently.
I'm a big fan of the Purolator Pure One air filter. It has great flow AND filtration specs.
Just sayin...check out the K&N via independent reviews. If I'm wrong, please tell me.

ethereal45
Nov 27th, 2011, 07:14 PM
I use Valvoline Maxlife 5w-30 in all of our cars, it is a very good oil according to oil analysis, and it is reasonably priced (although it's been going up lately...).

Cypresswill
Mar 29th, 2013, 03:36 PM
I use Mobile 1 Synthetic 5w30. A little more expensive but well worth it. It pays off with the increase mpg that I get.

Show 'N' Shine Car Detailing
Mar 29th, 2013, 03:52 PM
Valvoline synthetic 5w30. Used it in every car I've ever owned.

Motorsports-X
Mar 29th, 2013, 06:43 PM
Motul 300v with addp added 3000miles max. though ive never done a oil test to see if it can run longer(sure it can)

ffboy
Mar 29th, 2013, 07:55 PM
I've used 300v (5w40) 2x in the past, 300v itself can last more than 3000 miles easily... Bloody expensive stuff though... Now, Ive settled with a decent quality synthetic blend oil 5w-40 or 10w 40... I just change ot more frequently... Having an oil that lasts too long brings out the lazy guy in me. Changing oil more frequently (just my opinion) forces one to inspect the car more frequently and keeps internals cleaner.

Motorsports-X
Mar 30th, 2013, 05:54 PM
300v is a racing oil, while the oil certainly can take more abuse than 3000 miles will put on it. I stay more concerned with the repeated heating/cooling cycles, and the additional fuel that gets in the oil from cold starts. Neither of those situations do i beleive the oil is made to handle. Again, thats just my theory though. never tested it to see how bad its beat up. But its still green when it comes out, so its probably ok

vrodri16
Apr 2nd, 2013, 11:25 AM
I used Royal Purple 5w 30 with a K&N oil filter for the first 50, 000 miles at 3,500 mile intervals on my car. Switched to Mobil 1 Extended Performance with matching filter for the past 45, ooo miles. My car seems to idle smoother on the mobil 1. Every 3 motor oil changes I try and squeeze in half a bottle of Sea Foam.

Motorsports-X
Apr 2nd, 2013, 05:16 PM
you mean before youchange the oil right?