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
"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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