The car that introduced the XK twin-cam inline-six — Jaguar's post-war showstopper at 120 mph.
Launched at the 1948 London Motor Show, the XK120 was so named because Jaguar tested it at 120 mph at Jabbeke in Belgium. It used the new 3.4-litre twin-cam XK inline-six producing 160 PS, in three body styles: the original Roadster (Open Two Seater, OTS), the Drophead Coupe (1953) and the Fixed Head Coupe (1951). Early Roadsters used aluminium bodies (approx. 240 cars built); production transitioned to steel bodies in 1950.
Total XK120 production was approximately 12,000 cars across all body styles between 1948 and 1954.
Introduced the XK twin-cam engine that would power Jaguar through the 1950s and 1960s, and the founding sports car of Jaguar's post-war reputation.
| Variant | Years | Production | Notes |
|---|---|---|---|
| XK120 Aluminium Roadster | 1948–1950 | 240 | Aluminium body; defining early car. |
| XK120 Steel Roadster (OTS) | 1950–1954 | — | Steel body; majority of Roadster production. |
| XK120 Fixed Head Coupe | 1951–1954 | — | Closed-body derivative. |
| XK120 Drophead Coupe | 1953–1954 | — | Wind-up windows; folding roof. |
Start with identity, paperwork and originality. For the Jaguar XK120 Roadster, the strongest cars have continuous ownership history, matching numbers where applicable, original books and tools, factory build documentation and evidence of work by manufacturer-approved specialists. Aluminium body, matching-numbers status, original specification, JDHT certificate and continuous ownership.
3.4 XK twin-cam is well-supported; verify head condition, oil pressure and continuous service evidence. A proper pre-purchase inspection includes cold-start behaviour, ECU diagnostics and fault-code history (where applicable), leak-down or compression testing, underbody photography, suspension and chassis inspection, brake condition and a long enough road test to expose heat-related faults. Deferred maintenance on a car of this class is almost always more expensive than buying a better-sorted example.
Use a paint-depth gauge, lift access and a specialist familiar with the model's factory panel gaps and finish standards. Collector value is dramatically affected by structural repairs, refinished panels, poor paintwork and missing factory trim or option content. Documented cosmetic refresh is acceptable; concealed accident or fire damage must be priced severely.
Aluminium-bodied OTS Roadsters (approx. 240 cars) lead the market; matching-numbers steel cars in lead colours are the next tier. Specification, colour, options and limited-build variants move values significantly. Buy the best-documented example in the most desirable specification you can justify, rather than a tired example of a rarer derivative that will need years of corrective work.
Regional ranges authored independently — each reflects its local market, not an FX conversion
Budget annually even if the car is used sparingly. Fluids age, tyres and date-coded rubber components must be replaced regardless of mileage, and stored cars need exercise. A documented maintenance rhythm protects both reliability and resale value.
Jaguar Heritage and a strong global XK specialist network; restoration is realistic but expensive. Before purchase, confirm parts availability for model-specific bodywork, electronics, gearbox and engine components. A discounted car waiting on unobtainable parts or a factory service slot is rarely a saving in collector ownership.
Each region quoted in its local currency — independent market readings, not FX conversions
XK120 values are stable. Aluminium-bodied Roadsters with documented provenance lead; steel cars in concours condition trade in defined bands; project cars are not bargains given the cost of full restoration.
| Date | Auction | Car | Mileage | Result |
|---|---|---|---|---|
| 2025-08-15 | Gooding & Company Pebble Beach | 1950 XK120 Aluminium Roadster | — | $418,000 Sold |
| 2024-08-16 | RM Sotheby's Monterey | 1953 XK120 Roadster | — | $148,500 Sold |
Founding Jaguar sports car and the introduction of the XK engine. Aluminium Roadsters are blue-chip; concours steel cars are stable.
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