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Old    jmccallum            07-26-2004, 4:59 PM Reply   
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).

I know the viscosity is higher but have never noticed changes like this in other motors when I changed the oil.

Has this happened to anyone else?

Any bad stories? Things to watch out for?
Old     (mikeski)      Join Date: Aug 2003       07-26-2004, 10:26 PM Reply   
It's perfectly normal. Were your before and after readings taken at the same engine temperature? Colder engine = higher pressure
Old    tommyadrian5            07-27-2004, 7:35 AM Reply   
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.
Old    jmccallum            07-27-2004, 9:01 AM Reply   
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

Mike; I'm in Canada, engines never get
Seriously, the motor was fully up to temp when I noticed the pressures
Old     (trash)      Join Date: Jul 2001       07-27-2004, 5:42 PM Reply   
Don't engines (auto and marine) have oil overpressure valves so you don't blow a seal?

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.

Old    jmccallum            07-29-2004, 7:43 AM Reply   
There's no doubt that 0 psi is bad...

Thansk for the help guys


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