"Butch Davis" wrote in message
ink.net...
Far more likely, IMO, is an instrumentation issue. If the clearances in
your engine were so worn as to cause an oil pressure loss when hot with
10W40 oil you'd not have pressure when starting. As engine speed
increases the oil pump output increases. A relief valve keeps the
pressure from going too high. No offense Jim but you clearly know very
little about engines. Better no reply than a totally unfounded reply.

Butch, at first thought you would think the oil pressure would increse as
RPM increases but rod bearings when very bad SLING oil. Like if you (after
priming) sling a hose around your head it will pump water out of the hose.
This causes a loss of oil pressure! Very bad engines can have 15 pounds of
oil pressure at idle and that will drop when you accelerate the throttle.
I've read about it and finally saw it recently. Usually it's also very
noisy.

I'd certanly check oil pressure with a mechanical gage if the engine is not
noisy. If oil pressure is low I'd pull the pan and check clearances on the
bearings and if good suspect a slipping shaft to the oil pump.

Butch
"Jim Goodall" wrote in message
...
I'd be checking the crankshaft and rod bearings. Sounds like when things
get hot, clearances get large and simply let all the oil flow freely out
of the bearings, as the crank is spinning on a layer of oil, within the
bearings. It won't be long before you spin a bearing and ruin the
crankshaft.
Jim

josZ wrote:

The oil pressure in my engine, a volvo penta 3.0gs from 1996, is gone
above 3800 when the engine is hot. I use multigrade 10w40 oil. What could
be the problem?

thanks in advance Jos


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