Problems in a Jeep...you must be joking.
As long as you replace the transmission, transfer case, front and rear axles, brakes and rotors and a few hardware pieces every 30K you'll be fine.
Yes, I did say REPLACE, not SERVICE!!
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