I have never used Mobil 1 but keep hearing great things about it!
My choice has been Castrol RS 10w 60
synthetic, I have found it to be superior than other
oil, the only test I can compare was I used Valvoline race 50w, and then Valvoline synracing 10-40, would have to say these oils are crap, massive
oil pressure drops even on cold days, in my 650+bhp big block race engine. I get Castrol RS start off at over 70psi cold and end up with 60psi hot, and thats at 240F - so as far as heat stability goes Castrol RS is very good, I dont know about its actual lubricating value or the ball test etc.
Can you use the Mobil 1 racing
oil on the road, that is if you warm your Cobra up and give it a good run each time you take it out or race it?