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You are right about the 350 being a time-bomb.

The 300D turbo was only made for one year: '87.

The 300 is a 3.0 liter and is a GOOD engine that will last every bit as long as the older diesels. If not, longer.

As you will read through your research, these cars can be prone to aluminum heads cracking and warping if overheated.

I have 286K miles on my 300SDL, and the original aluminum head, though. No problems.
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