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Old 07-14-2003, 12:03 AM
Balckbob's Avatar
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Join Date: Jul 2003
Location: Orlando,Florida
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Talking 89" 300 Sel.....gasket Help !!!!!

So my mom bought this 89" 300SEL. It was very well taken care of and all just that the guy is leaving the country and said he wanted to get rid of it. Anywho when she bought it the guy told her it needs a new head gasket because there is anti-freeze in the oil...well wether oil in the anti-freeze reservoir. So he said that is most likely the problem. So guess who is stuck with the bill to fix it......exactly. I know what I'm doing because I have done this same job on out burban except I had to strip it down completely to replace the head all together. What I want to know is what else could it be to cause this phanaminon of oil in the ani-freeze reservoir ,and is there anything special I should know about doing this job by it being a benz ? Or is it just as straight forward as my burban just about ?

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Old 07-14-2003, 01:18 AM
1991300SEL's Avatar
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Join Date: May 2003
Posts: 545
You have what's called an M103 engine. Some call it that; others refer to it simply as a 103.

Use the search facility. There have been dozens upon dozens of posts covering head gasket replacement on this engine.
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Old 07-14-2003, 05:03 AM
sixto's Avatar
smoke gets in your eyes
Join Date: Jun 2000
Location: SF Bay Area
Posts: 20,793
Does your 'burban have overhead cams? If not, I'd say there's enough difference that you'd better get a proper shop manual if you don't already have one. The manual calls for 4 different sealants in the area of the top timing chain cover.

Doing this for the first time? Plan on 20 hours of solid work. No need for special tools. Certainly nothing you can't get at AutoZone.

The other thing to consider while the head is off is that the valve guides should be checked by an experienced tech or machine shop if the originals are still in place and have gone over 100K miles.

95 S420
91 300SE
87 300SDL
83 300SD
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