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Warning I did not spell check or check for typos.
The origonal block to oil filter gasket is just a paper gasket. They can srink and even fall apart over time. But, that is not the only plase it can leak. To the rear bottom if the Oil Filter housing is a bolted on plate that has where your Oil Pressure Gauge attaches and if you have a Turbl there is a banjo bolt and to crush washers.
The Plate has another paper gasket and the banjo bolt can be tightend too much and crack the plate and cause a leak. Some people have had the Turbo Oil Feed line crack.
The other issues are the the block can warp with heat and time and it is even possible or rust to eat under the gasket.
I like silicon sealant but this is not an area for that. Use a thin rubbercement type gasket sealer/adhesive like Gasgacinch. Essentially a high temp rubber cement.
The real mercedes replacment gasket has a thin sheet of Metal inside with a smooth rubbery coating on one side and a waffled/grid on the other side. Seems really well engineered for the job.
The other companies seem to sell some thick paper laminant. But, I have never actually seen one. People have used them with no issues.
When I did the job about 6 years ago I used the real Mercedes Gaskets.
What I found I could not do was use a Torque Wrench on all of the allen head bolts. I sub in some normal Hex head bolts and was able to fit a beam type Torque Wrench in to do the Torque. Others have said removing the Steering Box gives you lots of room.
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84 300D, 82 Volvo 244Gl Diesel
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