[jcat]

Before i started using Mobil 1, i wrote to Mobil for test reports - report was very technical but essentially, they tested it in NYC on cabs and police cars, ran them for 150,000 miles without an oil change, then tore down the engines completely to check for cylinder, piston wear and found essentially none - engine parts were like new.

That convinced me.

Ran Mobil 1 in a 1992 grand am, 1995 Ford Areostar and in a 1990 toyota corolla for over ten years each, changing oil (and filter) about once/yr or 20,000 miles, whichever came first. Never had any problems whatsoever. When i finally got rid of those cars, had 195,000 miles on grand am, 190,000 on the ford and about the same on the toyota (can't really remember on that one). All were running fine when I got rid of them - only gave them away because relatives needed them at various times.