Join Date: Sep 2000
Location: Washington, Michigan USA
Oil is Oil is Oil - as long as it's a brand-name and meets API specs, all your engine cares about is that the oil is clean, and reasonably fresh. If you run it hard all the time, 20W50 may show a little more pressure than 10W30, but it doesn't matter much - if you've got 10 psi per 1000 rpm, you're fine. Compared to motor homes or trucks pulling trailers, our cars put very little demand on their oil, except in very short bursts. Few commodities spend more on meaningless marketing hype than motor oil peddlers.
'69 Z28 Fathom Green