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Old 01-07-2002, 11:40 AM
Coming back from burnout
Join Date: Jun 1999
Location: in the Pacific Northwest
Posts: 2,274
How much oil could a diesel burn.....

I rebuilt my 240D motor. After a while (1/2 year) I noticed it using almost a 1.5 quarts of oil every 100 miles. I thought/think its going through the rings, but any car with rings that bad would have noticeable Exhaust Discharge, right? Smoke coming out of the exhaust like one of those really bad cars on the highway you see once in a while.
I might not be a professional engine blueprinter, but i dont think I did a horrible job putting in the rings (Non Mercedes parts). The car has good power and runs well.
Last week I found a small oil pan drip. Not a big one. Could this be the source? I had a similar leak on another car, it really made a mess on the driveway, but it turned out to have negligible oil loss.
Should I replace the pan gasket? Or do the rings instaed?
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Old 01-07-2002, 01:44 PM
franklyspeaking's Avatar
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Join Date: Dec 2001
Location: Decatur, Alabama
Posts: 379
I always like to isolate a problem whenever I know multiple problems may be occurring. I would fix or at least minimize the leakage, before doing the overhaul again. Eliminating the leakage may allow you to quantify the burning. I know diesels are renowned for their runability, even though mechanically weak, but 1.5 quarts/100 miles is a lot of burning for an engine that shows no other symptons (ie., hard starting, smoke trail, oil trail, etc.). In addition, there are other areas that could cause high oil consumption that you may be overlooking. Mainly, in the head (valves, seals, etc.).

My $.02 worth.
1998 C280
1982 240D Manual - Sold
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Old 01-07-2002, 04:30 PM
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Join Date: Aug 2001
Location: Milford, DE
Posts: 1,385
A leak that was reponsible for a 1.5 quart per 100 miles loss would be very large.

My 240D was using a quart per 300 miles before I rebulit it and there was no noticeable smoke from the drivers seat.... however when I followed the car in a chase vehicle I sould seen blue smoke quite clearly. Have your wife drive your 240D and follow in another car - you may see quite a bit of smoke.

When you did your rebuild did you check the cylinder bores for wear? Most of higher mileage OM61X engines have excessive cylinder bore taper - re-ringing alone will not solve oil consumption problems if your cylinders are not round.

Tim Freeh
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Old 01-07-2002, 04:54 PM
Posts: n/a
Not Mercedes but VW diesel

had the same type of symptoms on my wife's diesel VW 1994 Jetta. We bought it used and it used 1 quart every 200 miles when we got it. Never saw any blue or other color exhaust smoke whatsoever. Turned out to be a scored cylinder wall in #3 cylinder. Honed the cylinders and rebuilt the engine and have put 100,000 miles on it and it only uses 1/2 quart between oil changes (5000 mi). The thing to remember is that diesels burn the oil that leaks into the cylinder because of the higher compression so smoke may not be visible like on a gas engine. Also, no spark plugs to foul and make engine run rough. Even with the scored cylinder wall, my wife's car ran perfectly - but chewed the oil mercilessly. If you did not check the roundness of the cylinder walls before you installed new rings - that could be your problem. Hope this helps
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