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'79 240D, 83 300D
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Probably depends on capacity of engine.

If you are talking about your OM 617, the effect is probably not that great. In theory, you could increase likelihood of creating a leak though the oil seals.

If you are worried about it, pull the canister filter out quick and let it drain out into something and put it back, probably that would lower it by about a quart in a fairly un messy manner.
 

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1979 and 1980 300TDs
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Discussion Starter · #4 ·
Probably depends on capacity of engine.

If you are talking about your OM 617, the effect is probably not that great. In theory, you could increase likelihood of creating a leak though the oil seals.

If you are worried about it, pull the canister filter out quick and let it drain out into something and put it back, probably that would lower it by about a quart in a fairly un messy manner.
sounds like I don't have anything to worry about then.
 

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'86 W123 200, OM617 non-turbo, bastard 5-speed; '95 W202 C250 Diesel, OM605 non-turbo, 5-spd man
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Ahem!

 
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'79 240D, 83 300D
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Do you really think an extra quart in an 8 quart motor would cause a runaway? I guess if you have a leaky turbo.

I think danger to seals is greater.

I would not want to count on 'burning it off in 500 miles' though.

Come to think of it, the only runaway I have seen personally was a yellow 300D by the side of the road, years ago, before a car like that would have been in my reach, financially. It ran and smoked until it seized.

That said, I own and have owned a lot of diesels (mostly trucks), and am sure the oil level is sometimes a little high with no repercussions.
 

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S430 103K; E320 Wagon 143K
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Depends on why the oil is 1 qt high.

There was a classic call in on the Klick and Klack car talk show involving a high mileage Mercedes diesel. When the caller's son drove the car it used quite a bit of oil, when the caller drove it, the car didn't use any oil, but when the caller's dad drove the car, it made oil.

It was all caused by different driving styles and when the old man gently drove the car, fuel was leaking past the rings and accumulating in the sump, which diluted the oil.(not good) At any rate, if yours was just overfilled, remove enough oil to bring it back to the upper line.

There was an old tech bulletin warning of problems with some M119 V8 (gas) engines caused by overfilling the oil. My M119 never uses any oil, and I keep the level about mid way between the two marks. Don
 

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"Making oil" due dilution with diesel is not what I thought we were talking about here. That can have a bad outcome. If one is 'making oil' by blow-by, I would guess the motor pretty shot already.

Probably dose not happen on Mercedes engines, but a lift pump failure in the Chevy 6.2 often causes fuel to leak though hole in diaphragm into crankcase, 'making' lots of oil.
 
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