Inliners International Forums General Discussion Hi Performance What Do We Know About Oil ? ? ?

I've always used multi viscosity oils even in my '55 235 that is expected to use single weight 30. I don't use synthetics because the earler engines didn't require them and they are too expensive for me. I do however change oil frequently,3000 miles, and filter if the engine has one.I use Quaker State because the case price is good around here.