991 Porsche 911 Buyers Guide: What You Should Know
The Porsche 911 (991 generation) hit showrooms in 2012 and continued the legend into 2019 with sharper styling, more tech, and plenty of Stuttgart magic.
Today, the 991 sits in a sweet spot: modern enough to daily drive, classic enough to feel like a true 911. Whether you’re eyeing a Carrera, a GTS, or a Turbo S, buying a used 991 can be one of the most rewarding purchases you’ll ever make.
That said, there are some quirks, issues, and differences to keep in mind before you sign the checkbook. Let’s dive into our 911 991 buyers guide.
991.1 vs. 991.2 — What Changed?
991.1 models (2012–2016) carried naturally aspirated flat-six engines, from the Carrera’s 3.4L to the Carrera S’s 3.8L. They delivered glorious soundtracks but are known for higher oil consumption and carbon buildup.
991.2 facelift models (2017–2019) brought turbocharged flat-sixes across the Carrera range, offering stronger low-end torque and better efficiency, though some purists argue the soul shifted in the process.
991.1 vs 991.2 Comparison Chart
| 991.1 (2012–2016) | 991.2 (2017–2019) | |
| Advantages |
• Classic Porsche sound and throttle response • Naturally aspirated character across most models • Lighter, more traditional driving feel • Lower purchase price |
• Strong low-end torque and improved efficiency • Updated tech and cabin refinement • Broader torque curve, easier daily driving • More powerful Turbo and GT models |
| Disadvantages |
• Higher oil consumption and carbon buildup risk • Older electronics and infotainment • Greater long-term maintenance exposure |
• Lacks the old-school naturally aspirated character in Carrera and GTS • Higher used market prices • More complex systems with potential for higher repair costs |
Common 991 Issues to Watch For
Even bulletproof engineering has its weak spots. Some issues reported by 991 owners include:
| Oil consumption | This is particularly noticeable on early 991.1 Carreras, sometimes requiring top-offs between services. Excessive oil use can be a sign of worn piston rings or valve guide issues, and while often manageable, it is a red flag during a PPI. |
| Carbon buildup | Direct-injection engines are prone to intake valve deposits. Left unchecked, this can lead to rough idle, misfires, or reduced performance. Walnut blasting or chemical cleaning is often required around 40,000–60,000 miles. |
| Rear main seal leaks | This legacy Porsche concern still appears on some 991s. Look for oil spots under the car or seepage at the transmission bell housing. Repairing a leaking seal often requires engine removal, making it a costly fix if ignored. |
| PDK service intervals | Porsche's dual-clutch transmission is brilliant when maintained. Skipping fluid and filter changes can lead to harsh shifts, slipping, or failure. A properly serviced PDK should last well into six figures of mileage. |
| Electronics gremlins | Electrical issues crop up in this generation, from PCM infotainment resets to faulty sensors. Heat and age accelerate failures. Software updates and module replacements are common solutions, and a thorough scan during a PPI will uncover most hidden problems. |
None of these should scare you off, but they make one thing clear: a Pre-Purchase Inspection (PPI) is non-negotiable.
Why a PPI Matters
A Porsche 911 is more than a car; it is a precision instrument. Skipping a PPI is like buying a vintage watch without checking the movement.
At House Automotive, our Porsche-specific PPI service digs deeper than a generic inspection. We scope cylinders, check for over-revs in the ECU, inspect suspension wear, review service history, and hunt for signs of crash damage. A thorough PPI can save you thousands and ensure you’re buying a car worth your money.
HOUSE Automotive: Your 991 Porsche Partner
Whether you’re chasing a 991.1 Carrera S with a high-revving NA motor or a 991.2 Carrera T with a broad-shouldered turbo punch, HOUSE Automotive has the knowledge and tools to help you buy smart and drive happy. Our trained technicians know this 991 buyers guide inside and out and can give you a detailed roadmap for ownership.
Thinking about buying a 991? Schedule a PPI with us before you sign. It’s the best way to protect your investment and make sure your dream 911 doesn’t become a financial nightmare.
Disclaimer: HOUSE Automotive services Porsche® vehicles using genuine OEM parts. All references to Porsche® are for descriptive purposes only and reflect HOUSE Automotive’s service capabilities as an independent repair facility. HOUSE Automotive is not affiliated with Porsche Cars North America, Inc. or Dr. Ing. h.c.F. Porsche AG.