Anybody want to guess how they arrived at the 75,000 mile number on the label?

Ah, but Maxlife IS SM/GF-4, so that would not matter.Quote:
average age of vehicle old enough not to specify SM oils?
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Not a chance, 75,000 miles these days is nothing. They want to sell oil to compete with castrols hm, so they say for engines with more than 75,000 miles to get people with 75,000 miles to buy it. I believe castrols hm just says that it will stop leaks and noise and not all older cars have that problem.
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I don't know why they picked 75K but I do know who designed this oil. Her name is Fran Lockwood, VP of Technology for Valvoline.