Models · Porsche
Porsche 911 GT3 991 buying guide
The 991 GT3 arrived in 2013 with a new 3.8 flat six revving to 9,000rpm, PDK and rear-wheel steering. The 991.2 GT3 of 2017 moved to a 4.0 and added a six-speed manual, with GT3 RS versions of both generations.
The versions
- 991.1 GT3 (2013): 3.8 naturally aspirated flat six, 475PS, 9,000rpm limit, PDK only
- 991.1 GT3 RS (2015): 4.0, 500PS, 8,800rpm limit
- 991.2 GT3 (2017): 4.0, 500PS, 7-speed PDK or 6-speed manual; Touring version manual only
- 991.2 GT3 RS (2018): 520PS
- Rear-wheel drive with rear-axle steering; carbon ceramic brakes and front axle lift optional
What to check on a 991 GT3
3 model-specific things to look at when you view one. They're a starting point, not the full inspection.
Engine replacement history on early 991.1 cars
What to look for: Ask for the car's Porsche records showing whether it received a replacement engine under the recall, and any later engine work. A Porsche centre can confirm from the VIN.
Why it matters: Early 991.1 GT3s suffered engine failures, and some caught fire. Porsche recalled all 785 cars built up to that point and fitted new engines. A separate issue with the valvetrain finger followers (rocker arms) led to a redesign. A car with its recall work and any updates on record is the one to look for.
The extended engine warranty
What to look for: Check the date of first registration and manufacture, and ask for the warranty paperwork.
Why it matters: Porsche introduced a 10-year or 120,000-mile engine warranty for 991.1 GT3s, running from the date of manufacture. By now it has expired on most cars, so the engine's history and condition matter more than they did.
Oil analysis and engine noises
What to look for: Ask whether an oil analysis has been done, or arrange one. With the engine warm, listen at the back of the car for ticking or clattering from the top of the engine.
Why it matters: An oil analysis shows excess wear before it becomes a failure. The 991.1 used hydraulic valve lifters that proved troublesome, which the 991.2's 4.0 engine did away with, so valvetrain noise on a 991.1 needs looking into.
Also in the full guide
- Over-rev record
- Brakes
- The nose and front axle lift
- The cold start, test drive and paperwork checks for the exact version you're viewing
The full guide to the 991 GT3
The CrankSight guide walks you round the car on your phone at the viewing, with every check for the exact version you're looking at: what to look for, where to find it, and what anything you find is likely to cost. As you go it builds an assessment of that car, and if you view more than one, it lines them up side by side.
£29 for the model, used on as many cars as you like, delivered within 72 hours or your money back.
Other generations
Porsche 911 GT3 992 · Porsche 911 GT3 996 · Porsche 911 GT3 997
General points for the model, last checked October 2026. Every car is different, so treat this as a guide to what to look at, not a verdict on any car. CrankSight is independent and has no connection with Porsche.