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Mobile 1 is real good, one thing to remember, it like to find lil spaces to leak from. I am slowly changing everything out (oil, pvc, air filter and fuel filter(what a PITA). Next is trans and rear oil. Before going to Mobile 1, I will be replacing the valve cover gaskets. A previous car that I had small VC leak, when switched to syn, it looked like a blood bath in there. Replaced the gaskets and no more leaks.
Royal Purple is another great synthetic oil.I have used it for 30,000 plus miles and my mileage has increased by almost 2mpg.I drive a Cav Z24 with AEM intake,borla 2.25" exhaust,Royal Purple oil and tans fluid..auto.Best time 15.97 @86 mph in the quarter