Look at the top of the oil filter head, it's right below the IP.
Any oil leaks?
With the engine running, get under the car with a flash light and a rag.
Clean the oil of the oil filter canister all the way aruond the top.
Observe for leaks.
To remove the oil filter canister, loosen the 17 mm bolt on the bottom.
Some oil will come out.
Remove the O ring and inspect it for damage.
Inspect the lip on the can, where the o ring sits for any damage or bends.
Also check the aluminum oil filter head on the block, in the area where the O ring contacts it.
If every thing looks allright, install the can with a new O ring.
Don't tighten the 17 mm bolt until you have checked that the can is seated correctly in the oil filter head.
Use your flash light to see that the can contacts the head evenly all around.

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76 240 D. Bought in 1998 for $25.
85 300D. Got it for free with a bad engine. ( Sold )
60 Unimog 404. What was left of it, was given to me. Now powerd by 617A.
88 560 SEL. Bought without engine and trans. Now powerd by 617A.
67 250 SE. Cuope. For resto or sale.
64 220SE. For resto.