Good car, but check out what M.B.Doc had to say about when the engine received upgraded valve guides/seals. The one you are looking at may have never been redone. Even if it has, you're looking at a 13 yr. old car that may need a valve job irregardless of whether or not one was done in the past.
Pecking order/ history for M103 ?
1991 300-SEL - Model 126
M103 - SOHC
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