About the 300SD. The 14 inch wheels definitely provide a better ride than the 15 inch. I know from personal experience. The tradeoff, of course, is handling.

The '85 500SEL drives like your living room, and rides like a pillow.

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1987 300SDL (324000)

1986 Porsche 951 (944 Turbo) (166000)

1978 Porsche 924 (99000)

1996 Nissan Pathfinder R50 (201000)