I use OE or OEM parts ONLY! Nothing too good for my benzes.

Some parts are better oem, some parts better oe, you just have to figure out which ones.

Lemforder is great for suspension, better then dealer parts I think.

Oil filters in gas cars I use MANN and Diesel I use Hengst.

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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.