I switch from what ever junk the marina was using to Mobil 1 Synthetic 15W50 (as per engine manual) last fall. This spring (late up here) I noticed that the engine oil pressure was way up. Instead of 40 to 60 psi (depending on rpms etc) I'm between 60 to 80 psi. After a two week vacation it seems to be lower but definitely higher that last year. Overall the engine seems to be running fine (occasional run-on). <BR> <BR>I know the viscosity is higher but have never noticed changes like this in other motors when I changed the oil. <BR> <BR>Has this happened to anyone else? <BR> <BR>Any bad stories? Things to watch out for? <BR>

It's perfectly normal. Were your before and after readings taken at the same engine temperature? Colder engine = higher pressure

from my experience the oil pressure guage is pretty innacurate, mine reads 40 at idle and 80 at speed. From what I understand, the cruising and high speed pressure is innacurate, more important is that you HAVE oil pressure, rather than exactly what it is.

I think you're right Tom. I've never seen a change that big. If you're ok at 80 psi I guess I am too. Actually, it only peaks at 80 psi <BR> <BR>Mike; I'm in Canada, engines never get hot...lol <BR>Seriously, the motor was fully up to temp when I noticed the pressures

Don't engines (auto and marine) have oil overpressure valves so you don't blow a seal? <BR> <BR>I never worried about oil pressure as long as there was some. Mine always seems to sit at 40 when running and 30 when idling. <BR> <BR>Trash

There's no doubt that 0 psi is bad... <BR> <BR>Thansk for the help guys