300k is a lot, I wouldn't buy a car with over 200k on it unless it was cheap.

A proper rebuild on a 603 costs $8k and their are very few places in this country that can do it right. I would be leary of a rebuild.

You need to find something with half as many miles.

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200