I'm going to tackle this job during the next week or two but couldn't find a DYI article or post on exactly what to look for, tools needed, parts, etc.

I'd rather have everything needed in order to complete the task, rather than run all over town or wait for a shipment and not have use of my car.

I suspect that the hose that fits to the bottom of the air filter housing, (goes to the oil pan) is leaky, broken, and or not connected, as there is oil present. No major leaks though (i.e no puddle on the drive way, oily engine block or parts), which I guess is good.

I may even replace the seals on the U boot that connects the filter housing to the turbo, but that jobs looks fairly straight forward. Oh, and I'll probably seal the oil separator with some sort of sealant.

My goal is to 1) eliminate the knock/thump sound which occurs everytime I start the engine, 2) reduce oil in the air filter, and 3) stop oil leaking from the bottom of the air filter housing.

advice? words o wisdom? Links to a dyi article/wiki? all are appreciated.

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1982 240 D, 308,000 - 321,127 miles (sold)
1982 300 TD,166,500 - 226,000 miles
1998 E 320, 120,000 - 144,000 miles
2005 C 230 K, 26,000 - 77,000 miles (sold)