As for oil leaks, honestly the first thing to do is really clean the engine and engine compartment. It's highly probable you will have several sources and you will immediately be able to see which is worse than others. To see what is related to crankcase pressure, compare just idling to running hard under load. Engine blowby when excessive drives a lot of oil leaks

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'82 300SD - 361K mi - "Blue"

"Good judgement comes from experience. Experience comes from bad judgement."

listen, look, .........and duck.