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I have a 1980 Chevy C-30 PU with a V8 5.7 engine with 41,287 miles (no, that's not a typo). The original owner's manual recommends 10W-30 oil, changed very 3000 miles. When a group of us old guys with old cars/trucks, get together, the topic of oil/viscosity for our vehicles rears it's ugly...