My W116 had that problem. I replaced the gasket, trust me its a PITA but that car no longer drips even a single drop of oil any longer from anyplace.mountainredneck said:after giving my old 300d a healthy bath, i have noticed that the only oil leak on the engine is coming from where the oil filter housing is bolted to the side of the block. it is enough to create a 2" dia. spot on the carport overnite. do all you diesel guys have this problem? is it easily fixed? IE is that unit hard to take off and apply a new gasket?