Mazda MX-5 NB price

• The original NB offered 1.6- and 1.8-litre four-cylinder petrol engines with manual gearboxes. The early 1.8 is quoted at 140 PS by Goodwood. Specification, including a limited-slip differential, differs by market and edition. Goodwood.
• The 2001 facelift brought revised lamps, bumpers and cabin details. Its 1.8 gained variable valve timing and rose to 146 PS in Goodwood’s UK account. Goodwood.
• The 1.8 Sport combined the revised engine with a six-speed manual in the specification profiled by Goodwood. Editions such as the 10th Anniversary and other market-specific models may add trim or equipment, so verify the individual car rather than relying on an edition name alone. Goodwood.

Structural condition is the first value factor. Ask for photographs of any sill, arch or front-rail repairs before they were painted and undersealed, together with invoices identifying the work. Fresh underseal can protect good metal, but it can also obscure poor repairs. The front chassis rails deserve particular attention because their double-skinned construction allows corrosion to grow internally. A solid 1.6 can be a better buy than a rusty 1.8 Sport. Goodwood.

Once the shell is proven sound, compare the engine, facelift, gearbox, differential and original equipment. A later 1.8 with the six-speed manual and limited-slip differential may appeal to a different buyer from an early, simpler roadster. An intact hood, dry carpets and a cleanly shifting gearbox also affect value. Documented, correctly executed welding is more convincing than a claim that the car has “never needed rust work”. Poorly fitted suspension, forced-induction conversions or unclear modification history require their own inspection. Goodwood.

Inspect rear sills and wheelarches for bubbling, filler and uneven repair seams. Raise the car to inspect the front chassis rails, ideally with access behind the undertray. Goodwood warns that these rails can rust from inside out. Check floors, jacking points, suspension mounts, lower front wings, the boot floor and battery area. Surface rust on a replaceable suspension arm is a different issue from corrosion in the structure; ask an MX-5 specialist to distinguish them. Goodwood.

Inside, feel the carpets for dampness and check that the roof seals and drains work. Run the engine until warm, looking for coolant loss, oil leaks or signs of overheating. Test windows, central locking, brakes and gear selection. Seized brake callipers, tired bushes and dampers, and radiator deterioration are all reported age-related concerns. On the road, the car should steer cleanly and brake straight; a modified car that does neither needs diagnosis before purchase. Goodwood.

Goodwood advises replacing the cambelt every five years and checking the record if its last change is unclear. Ordinary servicing should include oil and coolant levels, visible leaks, brake condition and the roof drains. Keep the drains clear: trapped moisture contributes to sill and arch corrosion. Money spent on a proper structural inspection can be more useful than replacing routine wear parts after purchase, because rust repair is the expense most likely to exceed the value of a weak example. Goodwood.

Is the Mk2.5 a separate generation? No. It is the common UK name for the 2001-on facelift of the NB. The revised 1.8 engine and visible front-end changes help identify it. Goodwood.

Where is NB rust most serious? Rear sills, rear arches and the double-skinned front chassis rails are the priority. Check on a lift because sound-looking paint cannot prove sound metal underneath. Goodwood.

Is the 1.8 Sport worth seeking out? Its later engine and six-speed specification are attractive when the shell and equipment are sound. Do not accept structural rust merely to obtain the preferred badge. Goodwood.

Does a new hood mean the car is dry inside? No. Check seals, drainage and the carpets after operating the roof. Water may have entered before the hood was replaced. Goodwood.

Sources:

• Goodwood Classic Solutions, MX-5 NB buying guide — checked 4 November 2026.
• CarGurus UK, Mk2 MX-5 review — checked 4 November 2026.
• MX5 Parts, MX-5 generation guide — checked 4 November 2026.