What temp should the engine have when fully warmed up? I get 155 to 165 when running 65-70 mph, only time it gets hot is when I'm idling around in parks and places where speed is held down. I know an engine that is not running at the proper temps has a tendency to sludge up the oil.
Also oil pressure is what I think is low 13-17 psi at idle when warm, 35-40 at speed.
LC