Porsche 718 Cayman GTS 4.0 982 Reliability

The 718 Cayman GTS 4.0 brought back a naturally aspirated flat-six to the mid-engine Porsche lineup, addressing the criticism of the earlier 4-cylinder turbos. The 9A2 Evo engine is shared with the 911 Carrera and is generally robust. Watch PADM mount failures and GPF blockage on early cars.· more· less

Robust 9A2 Evo flat-six PDK and manual both reliable

PADM mounts fail repeatedly Expensive consumables

Buy if: You want a naturally aspirated mid-engine Porsche with strong values and can budget for premium parts and dealer labor.

Avoid if: You only do short urban trips (GPF clogging risk) or cannot accept €1,300+ engine mount replacements as a recurring item.

Maintenance costs

€1,750 - €3,200/year

15,000 km/year

Fixed costs

€1,300-2,300

Risk buffer

€450-900

Common Problems

PADM engine mount failure

€1,500 - 3,5001 of 6

Porsche Active Drivetrain Mounts fail repeatedly, sometimes within 6,000 km · more· less

The PADM hydraulic engine mounts are a known weak point across the entire 718 range, including the GTS 4.0. Failures appear as a 'PADM disabled' warning on the dash. Mounts can fail at very low mileage (some under 6,000 km), and replacement mounts have been documented to fail again within 1,000 km. Each mount is approximately €1,300 in parts alone, and the engine needs to be partially loosened for replacement, requiring realignment afterward. Porsche has not redesigned the part across multiple generations. Many specialists recommend solid or semi-solid aftermarket alternatives for owners outside warranty.

Water pump failure

€1,200 - 2,2002 of 6

Bearings wear and plastic impeller degrades, typically around 40,000-60,000 km · more· less

Water pump failures are common across the 982 platform. Warning signs include knocking or whining from the pump, coolant smell, visible drips, and erratic temperature gauge readings. Many specialists recommend preventive replacement around 50,000 km. Parts cost €400-600 with labor adding €700-1,000 due to accessibility. Catching it early prevents overheating damage to the otherwise robust 9A2 Evo flat-six.

GPF (gasoline particulate filter) blockage

€4,500 - 6,5003 of 6

Filter blocks on cars used mostly for short trips, replacement is very expensive · more· less

The 718 GTS 4.0 has a Gasoline Particulate Filter that can become blocked if the car is driven mostly on short trips that never reach full operating temperature. Owners report failures around 25,000-30,000 km, sometimes earlier. Replacement is around €5,000-6,000 at Porsche dealers and is not always covered under extended warranty as dealers attribute it to driving style. Drive the car for at least 30 minutes regularly at varying engine speeds to keep the filter regenerating.

PSE exhaust valve rattle

€300 - 1,5004 of 6

Sport Exhaust valves rattle at 2,000 rpm due to play in the valve mechanism · more· less

The Porsche Sport Exhaust (PSE) has a known design issue where the exhaust valves develop lateral play, causing an annoying rattle around 2,000 rpm. Almost all PSE-equipped cars develop this to some degree. Dealer fix is valve replacement at around €1,200-1,500. Aftermarket clamps and DIY fixes (€100-300) are popular alternatives. Not a mechanical safety issue but irritating in a €100,000+ car.

Connecting rod recall (2021 production)

€0 - 05 of 6

190 cars affected globally, all eligible received free engine replacement · more· less

Porsche issued recall AMA4 in 2021 covering 190 cars (718 Spyder, Cayman GT4, Cayman GTS 4.0, Boxster GTS 4.0) for connecting rods that failed quality inspection. Affected engines received complete replacement under warranty. Verify with Porsche using the VIN whether the car is in the affected batch and whether the engine has been replaced. If not affected, no action needed.

Wastegate / vacuum system issues

€400 - 1,2006 of 6

Wastegate-related faults have been reported and are usually replaced under warranty · more· less

While the 4.0 is naturally aspirated, the exhaust and vacuum systems still have wastegate-style mechanisms tied to PSE operation. Issues are uncommon and usually addressed under factory or extended warranty. Outside warranty, expect €400-1,200 depending on component.

One of the more reliable modern Porsches, but premium running costs

The naturally aspirated 9A2 Evo flat-six is shared with the 911 Carrera and has a strong reputation for durability. Main ownership friction comes from PADM mount failures, expensive consumables, and dealer labor rates. Service every 30,000 km or 2 years keeps the engine healthy. Outside warranty, plan for one significant unexpected repair every 2-3 years.

Pre-Purchase Inspection Checklist

General checks

Service history
Complete Porsche dealer or recognized specialist records essential. Verify oil changes at least every 2 years.
Tires
Check tread depth, age (date codes), and uneven wear. Rear tires wear faster on this car.
Cold start
Must start engine completely cold. Listen for unusual rattles or knocks in the first 30 seconds.
Test drive
Minimum 30 minutes including highway speeds. Test PSE on and off, PDK or manual fully through the gears.

Specific for this vehicle

Verify PADM mount status
Check OBD for 'PADM disabled' fault history and inspect mounts visually for sagging or oil weeping.
Listen for PSE exhaust valve rattle around 2,000 rpm
Drive in Sport mode with PSE open. A rattle here is normal but factor in replacement cost when negotiating.
Inspect water pump area for coolant traces
Look at the pump housing for dried coolant residue, drips, or staining on lower hoses.

+ 3 more checksShow less

Confirm connecting rod recall status (2021 cars only)
Verify with Porsche using the VIN whether the car was part of recall AMA4 and whether the engine was replaced.
Check GPF status and driving pattern
Ask the seller about typical use. Heavily short-trip cars are at higher risk of expensive GPF blockage.
Verify all service receipts and brake pad/rotor history
Brake parts are very expensive on the GTS 4.0. Know what has been replaced and what is due.

Recalls and Technical Service Bulletins

Connecting rod quality defect (recall AMA4, 2021 production batch, 190 cars) Verify with VIN

PDK shifter park-lock clip (2024 production) Verify if applicable

Contact Porsche with the VIN to verify all recalls have been completed. The 2021 connecting rod recall (AMA4) is particularly important as it required full engine replacement on affected cars.

Warranty Status

Factory warranty (2 years) Expired on most used cars (pre-2024)

Porsche Approved extended warranty Available from authorized dealers

Porsche factory warranty in the EU is 2 years with no km limit. Most used GTS 4.0 cars are now outside this period. Porsche Approved extended warranty is available and can be a good option given parts costs, though some specific items (e.g. GPF blockage attributed to driving style) may be excluded.

Sources: Research draws on model-specific owner forums and owner communities, recall information from official authorities, German automotive press, and multiple workshop cost references cross-checked against each other.

This report is for informational purposes only and does not constitute professional advice. Estimates may be inaccurate. Always have a qualified specialist inspect the vehicle before purchase. We accept no liability for decisions made based on this information.

Porsche 718 Cayman GTS 4.0 982

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