Thanks for the answers to my problem. In my case I had half of the filter housing with oil. I kept it open over night and in the morning I still have the same amount of oil. I removed the oil by sucking it from the housing. I installed a new filter, and pured oil in. When I turn the key to start the engine the meter for oil pressue was showing full pressure (3br). This is very suspisous.

Roman
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86 420SEL 228k