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Old 04-02-2002, 08:50 AM
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Question m 103 oil consumption

ý'm a w 124 300 e m 103 1986 euro owner. And the machine has
190 K miles on it. What is the average oil consumption for this engine? Thanks for your precious replies.
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Old 04-02-2002, 09:58 AM
pmizell's Avatar
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Join Date: Jun 2001
Location: Houston, Texas
Posts: 838
Tough question to answer without more information......

Lots of factors involved, such as how often have you changed your oil? Have you ever had valve seals and guides replaced?

If you have original seals and guides, and have changed oil often (every 3k miles) then one would expect to burn 1-2 quarts every 5k miles or so.

IF you are burning more than that, and/or you are seeing blue smoke from tailpipe, then it's time to change the seals/guides.

Good luck!


'91 300E, 208k miles
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Old 04-02-2002, 11:19 AM
Michael's Avatar
Join Date: Jul 1999
Location: CT, USA
Posts: 2,699
I just had my head redone, and am now at 178k miles. My car burns about a quart of Mobil 1 15W50 every 5k miles...I rarely add any, just change the oil! Before the head work, it consumed a quart every 2,500-3k miles
"If everything seems under control, you're simply not going fast enough" --Mario Andretti

1995 E500 street car
1986 Porsche 944 Turbo S track car
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Old 04-03-2002, 04:59 PM
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Oil consumption--M103 motor

I have a 1988 300E with 254,000 miles. Valve guides and seals were done once at 130,000 miles and once again at 244,000 miles. It burns NO oil whatsoever!
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Old 04-04-2002, 06:59 AM
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The early M103 engines had bad valve stem oil seals. If it is using a lot of oil, it is time to change them. With this many miles, you would be better served to do a valve job, replace valve guides and use the updated seals.

I would not do this without first doing a compression analysis to ensure that the cylinder/piston integrity warrants it.

Good luck,
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Old 04-05-2002, 01:11 AM
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Exclamation oil consumption

Thanks for your replies.
I've got an original maintenance manuel for 86 300 e euro and it writes out there that avarage oil consumption for brand new m 103 engine is 1lt/1000 km. ???I repeat this info isin its original
maintenance manuel book.
Waiting for your comments
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Old 04-05-2002, 09:38 AM
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Join Date: Aug 2001
Location: secret
Posts: 3,044
Let's see... If I converted that right it would be approx. a quart per 650 miles. Anything using that much oil has a problem!! Doesn't the manual also state that oil consumption should decrease as the engine "wears in"?
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