Diesel Power,

Check if you get alot of oily mist when you take the oil filler cap off while the engine is running. A little bit is OK but if it's really coming out it's not. If you are getting a lot then it suggests you have a blowby problem. The next step, assuming the crankase vent is clear, is to do a compression and leakdown test to see if you have a bad cylinder and/or possibly broken rings. Good luck.

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LRG
1987 300D Turbo 175K
2006 Toyota Prius, efficent but no soul
1985 300 TDT(130K miles of trouble free motoring)now sold