In various industries there are a variety of processes of controls in place to achieve a certain minimum standard. MB today sells parts and cars that have many manufactures that make these parts and they are either OE or OEM.

OEM can be a part made by another that is sold under the MB label. MB specs the part and the parts manufacture makes it to spec and proves it is.

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1980 300TD-T (82 Turbo and Trans) 159,000 Miles "Jackie-O"
1983 300SD 272,000 Miles "Aristotle"
1987 Jeep Wagoneer Limited - keeps the MB's off the ice and out of the snow
1994 BMW 530it