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Hi Sid, Sounds like Ed knows more than I do. All my engines had considerably low oil pressure. Changing to straight weight helped, but certainly wasn't high. Too high you don't want. Like you, I don't know if they lasted longer or not. Frequent changes is something I'm good at. Sometimes I get great life, maybe 300,000 miles on a gas engine, sometimes it's more like 150,000 miles. Different engines, so I'm in the dark. There's a 5.2 Dodge sitting in my driveway that will likely go well over 300,000. Never got anywhere close with the Jeep engines. We've got a new Ford now that I'm running the recommended low viscosity oil in. Pretty sure I read here that new tolerances are tighter and need thinner oil. In a few years I'll know if it works that way. I grew up in T_Bone's neighborhood with air-cooled VWs in a very hot climate. The only ones that went any distance had oil approaching gear oil viscosity in the engine. They clearly benefitted from a substantially heavier oil. My old tractors (about that age) get straight weight.
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