I drove my 300SEL from 139k miles to 145k miles, and it used an alarming amount of oil... probably almost two quarts every 1k miles.

The oil light would always come on when I was on the freeway and I would have to stop at a gas station and buy oil.

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Current cars:
2000 ML55 AMG, 174k miles
2003 C240 T-Modell, 202k miles
1995 S320, 207k Miles