Buy an XJ6 for a clean, dry shell first. Rotten sills that let the rear trailing-arm mounts pull from the floor will cost more than a tired engine ever will.
For this November 5, 2026 guide, I relied on the Classic and Sports Car Jaguar XJ6/XJ12 buyer guide and the Petrolicious XJ buying guide. So, the structural checks below follow those features.
Prioritize sills over low miles
Classic and Sports Car warns that when XJ sills rot they affect the security of the rear trailing-arm mounts, which can pull out of the floor if neglected or poorly patch-welded. A clean body is worth more than a low odometer on a soft shell.
Inspect floors, arches and the boot
Petrolicious and Classic and Sports Car both push buyers toward floors, footwells, wheel arches, door bottoms, boot floor and spare-wheel well. Probe from above and below. Fresh underseal without repair photos is a pause point.
Check screen surrounds and outer panels
Water at screen seals can feed sill and floor rust. Walk the outer sills and valances for bubbling and filler. Uneven panel gaps after a respray deserve a second look with a gauge.
Watch rear brakes and infrequent-use cars
Classic and Sports Car notes that rear brakes rust and seize with infrequent use and can be awkward to rebuild. A short drive should include firm, even stops from speed.
Read the drivetrain after the shell pass
Check that gears and kickdown work and that automatic fluid is not black, as the Classic and Sports Car guide advises. Cooling and oil leaks still matter on the XK six, but only after the structure clears.
Match Series identity to parts reality
Series I, II and III cars share risks but not all parts. Confirm which Series you are buying before ordering trim or brightwork quotes.
Use the history report for the right questions
Read title brands, dated odometer entries and changes of registration state before looking at service entries. Compare those events with the seller file and ask about gaps; a XJ6 that sat for decades can show long silences that are normal, while a sudden mileage drop is not. The federal NMVTIS program explains its title, salvage and junk data role; it does not replace a workshop inspection. Our rust-and-history explainer helps you separate a recorded conflict from proof of a particular fault.
Keep ownership paperwork separate from condition
Match the seller name to the title and request a written lien release where needed. Our lien-release checks explains the paperwork sequence. Federal odometer disclosure rules are summarized at Cornell LII, though older vehicles can be exempt from some disclosure requirements, so the absence of a mileage statement is not proof of anything by itself. Our service-record explainer covers what a missing service entry can and cannot tell you.
Set the offer after the inspection
Ask for separate estimates for safety work, overdue servicing and cosmetic improvements. A hypothetical $1,500 repair reserve is only a planning example; it can be inadequate on an older collector vehicle. A seller PDF can be edited, so obtain your own report using the identifier stamped on the vehicle. Ask for underside photos of both trailing-arm mounts before you travel to see the car.
We are a licensed CARFAX and AutoCheck reseller, not affiliated with CARFAX, AutoCheck or Experian. Recent advertised pricing has been about $5.50 guest, $4.50 member or $6.75 for a bundle; confirm the price and included reports at checkout. Buy the report before committing, then keep it with the inspection findings and signed sale documents.
Ask for underside photos of both trailing-arm mounts and a note on recent rear-brake work.
Book the inspection with a shop that has worked on this model before, and ask for a written report with photographs from underneath. Agree in advance who pays for the visit and what happens to your deposit if the findings are serious.
If the car has been sitting, ask whether the fuel system was treated and whether the cooling system was flushed. A pretty XJ that overheats on the first highway ramp is a different purchase.
Confirm which Series you are buying before ordering trim quotes, because brightwork and switchgear do not always interchange cleanly across the run.
Bring a flashlight for the spare-wheel well; water and scale there often preview sill problems you will see on the lift.
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