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Old 08-15-2000, 10:46 PM
Alex Kouliy
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I own an '87 260E. Odometer shows approx. 145,000 miles. Dealer records indicate 26 oil changes, twice per year on average. Average distance between oil changes = 5,600 miles. No work has been done on the engine (i.e. still has the original valve stem guides and seals), and it has never seen synthetic oil. Oil consumption varies between 1 quart per 1,200 (highway) to 1,500 (city) miles. I wonder if religious oil changes and/or usage of synthetic oil would have made any difference. Also, should I expect oil consumption to increase rapidly, or gradually from now on? I have owned it for about six months and I change the oil every 3,792 miles (6,000 km).
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Old 08-15-2000, 10:58 PM
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There is a lot of "what ifs" in your post. I don't think anyone knows for sure. More oil changes would have been better, that is for sure, especially if the person was doing a lot of city driving.

My Benz's recommend changing oil every 5,000 miles (300) and 7,500 (420) , although I change it much more frequently than that.

My manual says that I should expect to consume 1 qt. oil for every 2,000 miles on both cars. 300 burns more and the 420 burns less.

You are burning a little more oil than normal. It would be expected that you would burn more than normal in the future, but additional carbon deposits could act as a seal.

Maybe you may want to add one qt of STP oil treatment to thicken the oil. This may reduce oil consumption around your rings, IMO. I never used in on a Benz, but used it successfully on American cars.

'89 420 SEL
'90 300 SEL
'84 300 SD (sold it)
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Old 08-16-2000, 07:12 AM
Posts: n/a

It may very well help your oil consumption to replace the valve stem seals.

I take all kinds of flack on this site for my continual sermons about oil changes, but frequent oil changes are the best and cheapest engine insurance you can buy.

If everything else is okay with your M103 engine, you will probably see much more life from this engine before it's done.

Good luck,
Change oil hot and change oil often,

Larry Bible
'84 Euro 240D, 523K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in
Mercedes automobiles
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Old 08-16-2000, 10:26 AM
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Larry how tough is it to change the valve stems on a 87 300E? I can take apart and rebuild old chevy's and fords, before all that electronic stuff was put into engines (ahh the good old days).

If its not a home project then can a decent independant shop do this? What should I expect to pay to replace the valve stem seals?

1987 Mercedes 300E
Soon to be 2000 E420
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