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A very good possibility. Your new oil probably cleaned the sludge off of the rear main seal, which had dried out, and is now going to be a problem. The sudden change to 5W30 also didn't help.
You will also want to check the oil breather system. With the engine running, take out the oil dipstick and place a large piece of paper over it. If it is trying to draw the paper in, then that is good. If the paper is being pushed off, your oil trap and lines need to be cleaned out/replaced.
Klaus
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The 164 has a new home, all I am left with are 2 turbos :)
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