You should buy a late model 124, like 94 or 95 because the 86-89 ones are starting to have more miles and you have to do suspension links, and bushings and tranny and all that stuff at 150k miles. I just had to do the 87 300D turbo links and everything. Gas M103 and M104 engines leak oil on the back of the head usually. Sometimes the head warps.

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Current Stable:
1994 S500 v140, 210k miles, white with grey.

Former Mercedes in the Stable:
1983 300CD Turbo diesel 515k mi sold (rumor has it, that it has 750k miles on it now)
1984 300CD Turbo Diesel 150 k mi sold
1982 300D Turbo Diesel 225 sold
1987 300D Turbo Diesel 255k mi sold
1988 300 CE AMG Hammer 15k mi sold
1986 "300E" Amg Hammer 88k mi sold (it was really a 200, not even an E (124.020)
1992 500E 156k mi sold
etc.