Originally Posted by
smbstyle
Yeah, Grayson. He's real cool; I've been trying to get him over to autocross.
Yes, I'm running synthetic. I've been between Castrol and Mobil 1, both 5w30. Might try AMSOIL next. What viscosity/weight would be best for cooler temps? The cars dont have an OEM oil cooler, and I completely agree about creating more spots for failure, leaks, etc. The block already has in/out ports set up for an oil cooler though (LS6 motor from the Z06).
I run 15w50 most of the year. It's a mostly track car and I really don't drive it unless I know it will be long enough to heat the oil up. My goal was that when oil was 260-280 it was still thick enough to lubricate and create good oil pressure. Without an oil pressure gauge, you're really just guessing at the right viscosity. Having a Blackstone analysis from time to time is helpful to know you're not breaking down your oil, and that your engine is protected.
Maybe ask you instructor what he runs and what he does to control temps. I would at a minimum move to Xw40, ESPECIALLY in the summer.