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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