Aquariuscsm, the 300ZX non-turbo is not equipped with an oil cooler like the TT is. If I were tracking an NA I would look to installing an oil cooler to keep the temps reasonable...again just get an oil temp gauge to stop guessing. But again, just because you may feel a lot of heat when you open the hood, it does not mean the oil temps or coolant temps are running hotter than other cars with less crowded engine bays. But still, if I were to run a dino oil I would run with 10w40 in an effort to account for it shearing down during use.
Everyone has their own opinions on oil to use, but in regards to VR1, after seeing all this recent stuff I don't see it being any better than any other dino oil off the shelf like YB.
Jwagner162, after the event when I drained the oil and changed the bearings, the oil looked fine.. not like water. Besides the oil didn't have much miles on it. I don't think this engine is hard on oil in terms of shearing. What engine do you have in your race car if you don't mind me asking?
I agree with what is said here about the correlation between viscosity and heat, and the fact of oil shearing faster under racing conditions at high RPM (I would use Redline oil or similar) which is all really just common sense around here.
But I also think it is too easy to jump on blaming viscosity..
IMO, known oil starvation issues + 2 adjacent rod bearings damaged while others fine in hotter areas = caused by oil starvation.