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Old 03-30-2009, 09:22 PM   #26
STi-MAN
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maybe people will shoot me i use the heavier castrol gtx. and do oil changes around 2500.

10w40
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Old 05-29-2009, 04:44 PM   #27
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Just to bump this up... I wanted to see if other people using Rotella 15W40 (non-synthetic) at the track were having the same experience I am.

I have been changing the oil between every other event. Towards the end of the second day I noticed that the oil seems to degrade a bit. In a 30 min race, at about the 20 or 25 min mark I notice that the oil pressure will start to drop (from 75psi down to about 65psi WOT throttle). Then when I change it, it visually looks like it is time for a change.

I am getting about 250 miles in 2 race weekends between changes.

I'm thinking about switching to the Mobil1 15w50 or the Valvoline VR1 20W50 to see if I get the same results. I'm really not interested in forking out the $8-$10 per quart for Amsoil or Redline (flame suit on!).
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Old 05-29-2009, 05:53 PM   #28
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In cars I have built, I have run into more problems with mobil 1 than any other oil. The best oils I have used are Redline 5-40 (but does have a tendancy to blow-by) on high boost motors or AMSOIL 10-40 for street apps. and the new AMSOIL Dominator 15-50 for race and/or track day apps...

I have had more success with AMSOIL (reliability) in Subies, Evos, BMW, and Honda..
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Old 05-29-2009, 06:57 PM   #29
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I've switched to the Mobil1 15w50. I can't measure the pressure the way you do though so, I can't be more specific. It seems to flow better cold than the 0w-40 Mobil 1 I had been using. My car doesn't consume the 15w-50. It used to eat some of the 0w-40 though. The 15w-50's extended service oil for some of the euro cars that have 15K mile oil change intervals. I change mine every other track day or before 2 day events.
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Old 05-30-2009, 01:03 AM   #30
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amsoil 10w40 is what i use. haven't had any oil consumption issues yet. *knock on wood*
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Old 05-30-2009, 01:26 PM   #31
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We use Motul 300V Competition 15w50 in built motors on track and Castrol or Shell 5w40 on non built motors. Seems to work very well.

Tony
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Old 06-01-2009, 09:43 AM   #32
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I picked up some 20w50 "Not street legal" Valvoline this weekend. At about $5 a quart it seemed worth a try. Supposed to have elevated levels of ZDDP (1200ppm). If I can get through 2 weekends without the pressure dropping during a 30min race, I'll call it a success.

Thanks for the advice again everybody.
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Old 03-26-2010, 10:34 AM   #33
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Bumping this because I just acquired an 06 STi, and the dealer put 5W20 Amsoil in it. Autox school this weekend, I'm instructing and doing some "getting used to the car" runs in it. Which is pretty much WFO and see what it does when I _____. Is this oil too thin, or ok? I'll change it tonight if it's not appropriate for tomorrow's use.

Also, there's 5 quarts in it. Appropriate level, or adjust? Has Fumoto valve, so I can drain some easily if needed.

The car is stock except for a Scoobysport muffler, and I'll be burning up some RE070's.

Thanks!
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Old 03-26-2010, 10:40 AM   #34
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whoops
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Old 03-26-2010, 10:52 AM   #35
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Look at the owners manual. Severe service = thicker oil.
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Old 03-26-2010, 10:40 PM   #36
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Quote:
Originally Posted by MasterKwan View Post
Look at the owners manual. Severe service = thicker oil.
When someone is asking that question for a OEM motor or a straight forward built motor that started from a street car, I agree.

If the motor is being designed from the ground up, it can be designed to run with thin oil and significantly reduce windage losses. An example is that NASCAR engines run different oils for different situations, but one of the oils is 5W-20. In drag racing, you can see race engines running 0W-8. Obviously, it drives up engine cost, and has many other implications such as oil change intervals and rebuild intervals.
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Old 03-27-2010, 05:36 AM   #37
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So I changed the oil last night. Shell Rotella T 5w40.
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Old 03-28-2010, 01:30 AM   #38
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thats what Im running now in my stage 2 09 WRX, engine runs strong and cool but still getting some blow-by, about 1/2 qt every 500 mi. Easy tho casue I use the same oil in my car as all my 2 stroke dirt bikes!
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Old 04-26-2010, 05:32 PM   #39
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Bump-a-dump.

What's the "german" or "european" castrol people are talking about? Picked up the following and I wanted to see if it was good or bad:

Castrol Syntec 5w-40
Front says "Specifically formulated to meet the needs of BMW, Mercedes, Volkswagen"
Back says "Offers full synthetic performance, engineered specifically to meet Volkswagen engine service requirements" and later on "Superior European formula now blended in the U.S.A. Made in U.S.A. from domestic and imported components."
API Service SL, SJ, CF
Carries a number of manufacturer specific certifications for GM/VW/Porsche/MB/BMW

So what did I buy? I was just looking for synthetic 5w-40. So did I get something better than I expected to find or is some sort of strange VW voodoo that's going to kill my engine when I do a track day?
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Old 04-26-2010, 06:08 PM   #40
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Upon further review it looks like the "German" Castrol is specifically the 0w30.

http://www.bobistheoilguy.com/forums...Number=1757753

http://www.bobistheoilguy.com/forums...&Number=782392

So as long as this oil is SL/SJ compliant and the right viscosity, am I good to go anyway? Anyone used this before?
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Old 04-26-2010, 09:30 PM   #41
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I've heard nothing but good things about the GC 0W30, IIRC it's supposed to be more like a 40. No idea how it holds up on track though.

BTW... Mark sighting!
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Old 04-26-2010, 11:54 PM   #42
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Hey man, you still in the area/doing WDCR events? Hoping to finally get back out there this summer and have the SM guys beat me up.

I feel like even the best 30 should be too light for track/autox duty - even if GC is more like a 40 it's still less than a 40, and 40 seems like it would be the minimum for hard driving. Flip side, of course, is that I'm reading that a lot of the actual labeled 40s shear down to lower viscosities rather quickly. Very confusing. What a pain in the ass.
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Old 04-27-2010, 06:13 AM   #43
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castrol edge 0-40 is where it's at.
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Old 04-27-2010, 07:22 AM   #44
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Still running Mobil 1 15W-50 after many years. No problems at all.
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Old 04-27-2010, 08:10 AM   #45
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Valvoline Racing 20w50 here.
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Old 04-28-2010, 05:37 PM   #46
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Motul 300v 15w-50 here.
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Old 04-29-2010, 04:34 PM   #47
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We run Total synthetics from the Performance Oil Store (www.PerformanceOilStore.com). True PAO synthetic.

Feff
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Old 04-30-2010, 05:50 AM   #48
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Quote:
Originally Posted by Zoinks View Post
Bump-a-dump.

What's the "german" or "european" castrol people are talking about? Picked up the following and I wanted to see if it was good or bad:

Castrol Syntec 5w-40
Front says "Specifically formulated to meet the needs of BMW, Mercedes, Volkswagen"
Back says "Offers full synthetic performance, engineered specifically to meet Volkswagen engine service requirements" and later on "Superior European formula now blended in the U.S.A. Made in U.S.A. from domestic and imported components."
API Service SL, SJ, CF
Carries a number of manufacturer specific certifications for GM/VW/Porsche/MB/BMW

So what did I buy? I was just looking for synthetic 5w-40. So did I get something better than I expected to find or is some sort of strange VW voodoo that's going to kill my engine when I do a track day?
Just don't run it very long, IMO. It usually shears to a lower viscosity than GC does after some heavy use.

Quote:
Originally Posted by vicious_fishes View Post
castrol edge 0-40 is where it's at.
Unfortunately, it's not available in N. America.

-Dennis
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Old 04-30-2010, 05:08 PM   #49
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i ran ELF full syn 5w30, 5w40, 10w50 and TOTAL in similar grades..

recently switched to ELF 0w30 for a track day.. love it..

haven't notice any oil consumption at all since i bought the car 8 years ago..
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Old 04-30-2010, 08:47 PM   #50
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Mobil1 15w50 on a built motor here.
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