I had a 1993 E280 (same car). Great car, smooth, powerful and got many km's of service out of it. When I sold it, it had done 135 000 km.

It had the original wiring loom, but would have needed to be replaced at some stage as it was crumbling.

I also had a E320 - which was very similar, but on that I also replaced the head gasket because of oil seepage - as mentioned above a common failure item on these.

Both pricey items, so I would check if either have been replaced.