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Old 01-16-2005, 01:35 AM   #1
1/500yellowwrx
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Default Has anyone tried running Mobil 1 15w50 (performance driving formula) in their STi?

I am thinking of using this oil . It says it is for performance driving, and on the back it says it is good for turbo, and high power cars. IS this to thick? Or is it a good choice. Please chime in if you have any experiance with this oil.
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Old 01-16-2005, 03:08 AM   #2
casualsurfer
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isn't that oil weight kinda heavy?
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Old 01-16-2005, 03:33 AM   #3
grippgoat
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I haven't tried it. But I do know the owner's manual recommends running heavier oil under harsh applications. It lists things like towing and lots of short trips, but I'm gonna guess lots of track events would fall under that category, too.

I'm gonna guess that this would not be the appropriate time of year to try an oil that heavy, though.

-Mike
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Old 01-16-2005, 04:58 AM   #4
02blackdub
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i would wait till the summer thats what i do now i have the 5w 30 but i did have the thicker oil for the summer for going out to the track.
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Old 01-16-2005, 05:19 AM   #5
supersport
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I would stick with what the owners manual says. Thicker oil is going to lower horsepower by creating more drag.
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Old 01-16-2005, 08:49 AM   #6
dmross
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No harm in running 15w50, especially if you have modified your STI. The small loss in hp (we're talking 1-5hp here) is worth the added protection. I only run 15w50 but then again, I rag the HELL out of my car every time I drive it and at 8000rpm I wouldn't be to confident with 5w30 over an extended thrash session.

If you are at stock power levels and use the car as a daily driver, including winter, 5w30, 10w30 or 10w40 should be fine. If you are making tons of power and do a lot of continuous track driving a heavier oil will help keep your engine alive longer.
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Old 01-16-2005, 09:15 AM   #7
1/500yellowwrx
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My car is modded a little. I have a txs tbe, perrin Short ram, gpmoto header, And a tuned utec running 20psi. It is not a daily driver, and when I do drive it it is pretty harsh. I will be doing about 4 track events this year and a few solo1 events also. I think the next oil change will be useing the 15w50.
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Old 01-18-2005, 10:15 AM   #8
italy wrx
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I run Redline 20w50 all year long in Phoenix with no problems.
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Old 01-18-2005, 10:23 AM   #9
z&cobb
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I tried it for about 5 days in a 300ZX. Performance was sluggish. So I replaced it with the 5w-30 that Nissan recommended (Western Maryland climate).

Try it. You can always drain it out. It might work for you, since NC is a warm southern state.
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