The BMW Z1 is not just the German company’s original Z model, it’s also one of the most unique classic roadsters you can buy at the moment.

This lovely example is a 1991 model with only 18,000 miles on the odometer. Finished in Chilli Red, it comes with a Classic BMW Certificate and is described to be in exceptional condition.

BMW only made 8,000 Z1s, all of them left-hand drive and powered by a 2.5-liter six-cylinder engine with 168 hp and 164 lb-ft (222 Nm) of torque.

In fact the car’s underpinnings came from the E30 3-Series but the design choices of the Bavarian carmaker make the Z1 such a special vehicle.

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The bodywork features plastic panels while the real party trick of the BMW Z1 is none other than its doors: instead of working like a normal hinged door, these slide up and down to open and close, making it possible to drive with them fully open.

The cost for the coolest car doors on the planet is the unusually high door sill, but this makes sense since it has to be big enough to fit the door inside.

If you feel intrigued, then head over to Silverstone Auctions’ May Sale on May 19 and place a bid for a chance to own the coolest doors on the market; the rest of the BMW Z1 comes for free.