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#1
12-01-2005, 12:09 AM
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OiL leak, M103 3Ltr. 300e 1991
Hi, looking for a little info from those knowledgleable with thi M103, in a 1991 300e. 256000 miles!!!
I have a bad head gasket (oil in The Coolant, Driven that way for 2 years now) and a fairly bad leak out of the rear passenger end of the motor somewhere (Onto the Floor), I am planning on haveing the gasket replaced and head rebuilt, next week, ($1500 Job). My Question: Is the M103 known for commonly leaking oil in rear beyond the head gasket or valve cover, Perhaps the rear main seal like common on small block chevys with high mileage. I,ve only owned the car about 6 months and knew it needed the gasket when I bought it and have little history of it before my purchaseing it. the car Runs, Drives and looks incredable for it's age and mileage. Possibly the $1500 might be better spent on a used motor with lower mileage, than the R@R of the current gasket and head. I just don't want it leaking oil after the head R@R. Thanks in advance For You Comments and input. John
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1991 300e 255K (14.62mpg) 1979 Corvette L82 (sold) 2000 Custom Harley Sporty 1200 (Ride Hard or Stay Home!!!). 1973 Dodge Charger 440 (sold) 
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#2
12-01-2005, 09:44 AM
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it is a common problem, but the engine has a strong bottom endif you read thru some of the posts you will see some 300,000 milers still running strong, so even if you find a low milage engine it still might need the head done
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#4
12-01-2005, 11:27 AM
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They aren't known for bottom end problems or leaks although at 250k a leak is certainly possible. Are you sure it's not your head gasket leaking at the back?
If you knew for sure that the used motor was low mileage it's worth considering. How can you know for sure? I'd wan't to see it pulled out of the actual car. Jorg
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