New Jaguar owner myself. Bought mine 5 days ago. Checked the CARFAX and found it only had 2 owners. The car stayed in Florida, no rust, until a dealer in my area bought it. The CARFAX also reported several maintenance visits.
I am no professional on Jaguars, and I’m sure lots on this forum can correct me, but what I’ve read prior to purchasing my Jag I’ve found at 60,000 miles is when the gremlins start showing up. I felt comfortable enough to purchase my Jag based from that and the car is at 65,000 miles.
Short of it is I know gremlins are coming, but I’m ready for it, not only mentally, but financially as well.

 

Looks really nice, you will get more love in the xk150 forum!
wj