Thank you guys, I appreciate your help. This guys seemed a little uncertain about what exactly he should be doing and whether or not he was getting ripped off. With the info you have provided I think I can help him make a decision that's right for him. I don't know how many miles he puts on the car or what kind of oil he (or someone else) has been putting in the engine, but now I am better prepared to talk to him next time.

Thanks again!

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'95 E300D ("Tank") - 231,000 miles
'79 240D ("Biscuit") - 197,250 miles (Sold)
'83 240D ("Ding-Ding") - 217,000 miles (Death by deer)
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"Back off, man. I’m a scientist” ~ Peter Venkman