Im looking to buy a 95 S420 with about 140k miles. I wont have a chance to get out and drive it until this weekend but the owner told me over the phone occasionally its a bit sluggish under acceleration and he thinks the cause is spark plugs or a fuel filter. Does anyone know what this could be? the original owner had records stamped in the book for maybe the first 50-60k iirc. but after that no real records.. I did some searching but nothing specifically on the W140 V8