Greetings Everyone:
Recently joined the forum as I am proud owner of 2002 XJ8 VDP/Slate Mica Grey with beige interior. A beautiful car with 82,000 unmolested miles. I spent some serious coind for mechanicals and body work. Now that I am driving it every day just noticed one thing: some vibration in the steering wheel and body at idle and low speeds/low throttle...not horrible mind you...and a related soft engine drone at 50mph that goes away at lower and higher speeds. Do XJ8's need engine and transmission mounts replaced periodically? This isn't a major complaint but the car is so smooth and silent the harmonics and vibration stand out. Thanks for any suggestions or advice. Just love the car!

 

I had tire tread drone at version speeds only. Does not explain idle vibration but you may have 2 issues :-)

 

Your car is an earlier version than this part of the forum covers, you will probably get a better answer in the earlier model section.