What is the Mileage on your Engine?
I would try doing the same test with the Oil Fill Cap removed and see if the Oil level is lower.
If the Oil level rises when you put the Oil Fill Cap back on I would guess you are still haveing an exccesive Crank Case Pressure Issue.

Try changing the O-ring up on the Dip Stick to a Tighter one to help decrease the chanc of a leak and hope for the best.

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84 300D, 82 Volvo 244Gl Diesel