Year: 1989
Model: 300CE
Mileage: ~217,000
Oil Consumption: right now, none
Oil Leaks: none
Any top end work: valve guide seals

complete documented maintenance history, spotty, or non-existent?
Yes, complete maintenance documentation since new.

About every 75,000 miles, the valve guide seals need to be replaced. After replacement, the car burns less than a quart every 3,750 miles (my oil change interval). I can tell the valve guide seals need replacement because the car will start burning about a quart every 1,500 miles or so. No other top end work performed.

__________________
-Steven

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1959 190b, totalled
1968 220D, sold
1969 230/8, sold
1980 240D manual, gave away at 300k (stupid me)
1985 190D 2.2 manual, gave away to a youngster
1989 300CE, sold when I retired - major regrets