The guy at the local Jiffy Lube keeps trying to get me to put synthetic oil (at a $50 upcharge) in my 2007 Toyota with 65K miles on it. He says it's recommended.
I suppose I might get 2% better gas mileage, but I don't think there would ever be a payback.
My Volvo diesel (in my boat) has 3K hours on it with dino oil and it's running fine. I think I'll let well enough alone.
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