The type of racing is on a 1/4 mile dirt track oval. The engine is a 1.8 liter engine in a 1990 Acura Integra. These cars are completely stock, but run about 5,500-6,800 RPM for the entire 5 mile race. I don't know about oil temps unfortunately, but the water holds constant temperature. I know that is not saying much though.
I have both M1 High Mileage 10W-40 and M1 SM-rated 15w-50. I just want to obtain good wear/general protection and safe oil pressure during the races. Thanks!
Just curious, are you using the OEM 170F thermostat? I've used Mobil 1 0W-40 in very high stress situations, high speeds, redlines, etc. and it held up great. I haven't had any experience with either of the other oils in my B18 so I probably won't be helping at all with this post.