My dad drives around in a 2001 E320 4matic with ~160K miles on it.

I know it has had nothing done to the AWD system. No leaks, no noises, nothing at all.

The engine uses about 1 qt of M1 every 3500 - 4000 miles, I guess.

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1987 300SDL (324000)

1986 Porsche 951 (944 Turbo) (166000)

1978 Porsche 924 (99000)

1996 Nissan Pathfinder R50 (201000)