My wife’s X300 has 230k miles on it. We bought it at 80k miles and since then it is all highway miles. Prior maintenance is unknown. I have maintained the car with regular maintenance (oil/filters/etc). I do all the maintenance on my X300, XJ40 and XJS and have a 4ft lift.
I’ve just replaced the diff, center bearing, prop UJs (re-balanced the prop), transmission mount, starter motor, alternator, belts. Hubs/rotors/brakes/shocks etc. are all maintained regularly. I’ve done all the rubber, ball joints, vee mounts etc previously. I’ve also done the power steering rack & power steering pump previously.
Yesterday I sent my crankshaft damper off to Dale for re-manufacturing and will be changing the seal, the spacer if grooved or damaged, & the woodruff key. There is a slight leak at the seal.
This raises the question about timing chain guides / tensioners etc. as I have a week before getting the damper back.
While I’m not looking for additional work I’m asking experienced heads to tell me where the likely trouble spots are going to be, specifically engine related that can really hurt.
What should I do preemptively?
PS I’d like to get this car to 400k miles if possible