Austinorson wrote:Source of the post ....I am carefull not to over fill, any engine, does that cause excess oil pressure?
No, in fact quite the opposite. The oil will foam up and get aerated by the crank if there's too much in the sump, the pump can't move oil in that condition. This can reduce pressure, cause complete pressure loss, overheating, foul plugs, blow seals, cause excessive exhaust smoke, etc. Because of it's influence on engine performance, checking for an overfilled sump is on the list of a good tech's first things to check when diagnosing runnability issues.