Depends on what the maintenace has been like. I just picked up an '83 240D which hadn't really been maintained for several years. There are very few rubber components that don't need replaced. So, crawl underneath and check out all the rubber bushing and boots, etc on the supension so you have some idea of what you will be getting into there.

Ask about the clutch and if it has been replaced? If so, specifically what components were replaced.

Check to see that the vacuum componets are working properly, but don't be surprised if some are not.

Take the oil filler cap off and check the blow by. Ask about the type of oil used and how frequently changes have been done.

Lift up the carpeting on the floor to see if it is rusting from the inside out - apparently not uncommon.

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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