Question about 1991 Mercedes-Benz 300 Diesel

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Never owned a diesel

Recently I purchased a 91 Mercedes-Benz 300 2.5 turbo diesel. The car has 240,000 miles on it. I can't believe it looks, drives and runs so well with so many miles on it. I noticed in the trunk that the previous owner had a diesel fuel additive and I was wondering if any other M-B diesel owners recommend a diesel fuel additive. Any other suggestions for care of the vehicle?
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Yes very much so in the winter.. diesel fuel can gel if it gets cold enough ...that why you see semi trucks sitting on the sholder of the road on really cold days when there fuel gels,,,,,,if you live near a truck stop or or where trucks fuel look for HOWES fuel treatment it works great...if your car has a block heater on it keep it plugged in on cold days car will stat easier ... hope this helps...

Posted on Dec 11, 2008

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The turbo charger has more to do with rpms than road speed.The turbo uses exhaust gas leaving the engine to push more fresh air into the engine thus creating higher compression and more horse power.You should feel some boost above 1500 rpms if everything is working properly.If not then you should have the system checked by a dealer or a good diesel shop.Good Luck!

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Jun 01, 2010 | 1991 Mercedes-Benz 300 Diesel

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Oct 05, 2009 | 1991 Mercedes-Benz 300 Diesel

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Jun 30, 2009 | 1991 Mercedes-Benz 300 Diesel

2 Answers

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Hopefully it didn't already cause too much damage to the glow plugs and engine in general.

May 12, 2009 | 1987 Mercedes-Benz 300-Class

1 Answer

Wont start sometimes, rough idle.


Sounds like a bad ignition switch. If your car has a lot of miles (200k miles is pretty common), then it's likely.

Once something breaks loose in the ignition switch, well basically you got lil pieces of metal floating around making contact where they shouldn't, which create the scenerios you're talking about.

The glow plug light may or may not be related. But you won't know til you get that first problem fixed.

If the rough idle eventually smooths up after it warms up, then yes, you probably need to look at the glow plugs and/or glow plug relay.

Jan 27, 2009 | 1984 Mercedes-Benz Mercedes Benz 300 Class

1 Answer

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Dec 17, 2008 | 1987 Mercedes-Benz 300-Class

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