I would make sure you use a diesel rated oil (dino or synthetic) and change it every 2500 to 3000 miles - no flush. I use mobil1 ATF in the trans and think it is great. Dittos to the MB coolant, power steering instead of atf, and DOT 4 brake fliud. Don't forget the rear axel!! and re-connect the speedo cable

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1996 (W210) E300D 86K - Traded in for a Lexus
1992 (W124) 300D 2.5 Turbo 202K - Sold
1983 (W123) 300D, 146K - Sold
1970 280S, 263K - Sold - Beginning of addiction