Should in be in diesel forums.

For the most part yes. Most of the car is mechinical however there is some electric parts and systems.

On 85 they introduced electrical egr which had a different fuel pump.

85 is the best year because of the gear ratio in the rear differential.

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)