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Old 03-19-2003, 05:54 PM
Mike Richards Mike Richards is offline
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Join Date: Dec 2001
Posts: 565

I you believe the owners manual, 1/4 down means you have used approx. 1/2 qt. of oil.

1/2 qt. of use in 1500 miles in an M103 motor ain't too bad. I wouldn't worry about it 'til you're using a qt. every 1000-1200 miles.

Steve Brotherton has pointed out that the biggest problem is worn valve stem seals. MB switched to better valve guides in Apr. 1988 - M103. Look along the rear of the cyl. head - passenger side. If you see oil leaking there, it may be time for a new head gasket. M103 motors sometimes leak from this area. Make sure it's not the valve cover leaking if you have oil in this area.

I had valve stem seals, new head gasket and upper timing cover u-gasket replaced on an M103 motor last Apr. and my consumption went from 1 qt. every 1200 miles to about 1/2 qt. every 2500 miles.

My 2 cents.
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