Porsche 911 GT3 2017-2021 Reliability & Common Problems

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Pros

4.0-litre engine improved reliability over previous 3.8-litre unit

Good Porsche dealer network makes it easier to get genuine parts

Cons

Parts are expensive to replace

Watch for modified cars that have been given power upgrades

Is the Porsche 911 GT3 reliable?

Overall, the 991.2-generation GT3 is a reliable car and far more durable than the pre-facelift model it replaced.

Early 991 GT3s were at risk of catching fire due to an issue relating to the engine's connecting rods, and after a number of incidents, Porsche recalled all cars to rectify the problems that afflicted the 3.8-litre unit.

While the 4.0-litre engine isn't totally free of faults, it is much more robust thanks to its use of stronger materials – many owners have covered big miles without fault.

Considering how highly strung the engine is, we'd recommend a full Porsche warranty for peace of mind.

Engine: The 4.0-litre is far more robust than the 3.8-litre unit, but there have been a few cases of engine failure, variously attributed to causes such as oil starvation or low cylinder compression. Porsche often covers engines under warranty, but be sure to check the service history.

Gearbox: Issues with both the manual and PDK ’boxes are rare but make sure gearshifts are smooth because a replacement for either is obscenely expensive.

Brakes: Be wary of cars fitted with carbon-ceramic brakes. Their stopping power is unrivalled but they can cost between £10k and £13k to replace. Make sure they’re not worn or pitted.

Tyres: Check they’re in good order, with no bald spots or uneven wear. Michelin Pilot Sport Cup 2 items are great for track use and Michelin Pilot 4S tyres are ideal for the road. A full set of both won’t come cheap, mind.

Body: Inspect the underside of the car for any scuffs and scrapes, especially if it has been used on the track.

Interior: Full-carbon bucket seats are snug and secure but check that the hip bolster nearest the door hasn’t been worn down by the previous owner getting in and out.

The manual gearknob plastic can break and fall off, although you can easily source a replacement from Porsche or via an independent specialist.

An owner’s view

Robin Titterington: “After driving my friend’s GT3 RS, I knew it was time to buy one myself. The RS was a bit over the top for me, so I bought a 991.2 GT3 with Comfort seats and carbon-ceramic brakes. It’s a brilliant car and one that’s better suited to ‘normal’ driving.

My car’s Michelin Pilot Cup 2 tyres generate a lot of noise so I intend to swap these for Pilot Sport 4s. For peace of mind, I bought an extended warranty, but I’ve had no issues so far. It’s an exceptional car and I’d recommend it to any sports car enthusiast.”

Also worth knowing

Not all GT3s have full-bucket seats. If you’re after a more road-biased car, you’ll have no trouble finding a GT3 with electric Comfort seats. Alternatively, there are carbon-backed Sport seats, which look superb and are reasonably comfortable.

The Clubsport package comes with a full roll-cage and a fire extinguisher, so it is worth considering if you plan to use your car for track days.