Just to be sure, cut a small bit of insulation in the channel the holds the wiring going into the coil area. that is the area most-likely to be affected if the wiring has not been changed. if you see crumbled wiring insulation inside, then you will need a new harness.

the smaller wires near the oil filter are for the lower wiring harness. not-essential to engine performance, and you could rebuild your own easily....

good luck !

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1993 300E, 2.8 M104 .....