My '85 has almost 160K miles with over 100K of that going up and down some pretty big hills here in S.F. No problems so far. I have done the 30K oil and filter changes religiously and recently converted to synthetic trans fluid.

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LRG
1987 300D Turbo 175K
2006 Toyota Prius, efficent but no soul
1985 300 TDT(130K miles of trouble free motoring)now sold