[Sweet Emotion]

Originally Posted by wakespeak

15w-50 here mostly to all year. I saw oil analyses on bobistheoil.com with some LT4s with mixed street/track with 15w-50 and results were fine. The one thing I don't like is carbon coking on the dip stick.

19k miles on car, about 9k track miles.

I use Motul 300v 5w-40 otherwise and the engine seems to like it. Its a thicker 40 grade with ether oil base.

Surprised you run Motul 300v 5w-40 for the street. I've heard it burns out CATS quickly.

[That1guy_tim]

Originally Posted by Katech_Zach

I used Valvoline VR1 Racing 20w-50 in my 8000 RPM LT4 for track use.

For street/track guys, i would use the new Z06 oil Mobil1 Supercar 5w-50

+1 for Valvoline VR1

[SpeZ]

Mobil 1 15W-50 is the goat.

[Badmojo]

Unless you are doing regular oil sampling, then it's all hypothetical. I run 15W-50 year around now and change after 4-5 track days. Great looking oil sample results. Make sure the oil is up to 160 F or hotter before you hammer on it.

[FastEd]

PG14 out of the high performance supplement 2024. LT1 and LT4 can use 0w-40 dexosR on street and track combo. I put that in mine before autocross. Car did well. Drove it home still in one piece, I kept an eye on my oil temps after each lap and everything was running same as normal daily driving, 1+/- dash above 95C.