Mercedes-Benz S-Class

What should you look for in purchasing a Mercedes Benz 300SD or 300SDL?

I have owned about 20 used Mercedes over the years, including several diesels. The 1978-1985 or so 300D (midsize or 123 body) and 300SD (large size or 126 body) 5 cylinder turbodiesel is bulletproof with regular maintenance. 300,000 miles or more with just routine maintenance is not unusual for t...

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