Rotary-powered thrill ride — rewarding but risky
The RX-8 remains the last rotary-engined production car and offers a unique driving experience that no piston engine can replicate. Superb chassis balance, rev-happy engines and clever freestyle doors make it a genuine enthusiast's car at bargain prices. However, the Wankel engine's appetite for apex seals, oil and fuel means ownership is a calculated gamble — a compression test before purchase is non-negotiable. Low values have left many examples neglected, so finding a well-maintained car is critical.
We track 11 known issues across the Mazda RX-8 range, including 2 rated as safety-critical. Knowing which variants and configurations to approach with caution can save you from expensive surprises after purchase.
Found a Mazda RX-8? Check its service history to see if it's been properly maintained. We'll also flag which of our 11 known issues apply to that exact car.
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SE (2003–2008) — Engine options included the 13B Renesis. Our database flags 8 known issues on this generation, 2 of which are rated as safety-critical. The most significant concern is Apex seal failure.
SE3P (2008–2012) — Engine options included the 13B-MSP Renesis. Our database flags 9 known issues on this generation, 2 of which are rated as safety-critical. The most significant concern is Apex seal failure.
The apex seals are triangular metal strips that seal the tips of the rotary engine's rotor against the housing wall, performing the same function as piston rings in a conventional engine. On the 13B Renesis engine, these seals wear prematurely due to inadequate lubrication and high operating temperatures, causing loss of compression and eventual engine failure. This is the most common catastrophic failure mode on RX-8s, with rebuild costs often exceeding the car's value. The Renesis design eliminated oil injection into the combustion chambers for emissions compliance, reducing apex seal lubrication compared to earlier rotary engines.
Complete apex seal failure renders the engine inoperable and requires a full rebuild costing £6,000-£12,000 or replacement with a remanufactured unit costing £4,000-£8,000. The car should not be driven once apex seal wear becomes severe as further damage to the housing will increase rebuild costs dramatically.
Listen for any unusual knocking, tapping or rattling from the engine at idle and under load. Check the oil for metal particles or discolouration. On higher-mileage examples, a professional compression test can reveal internal wear before it becomes critical.
The RX-8 suffers from widespread suspension component deterioration at rates far exceeding the national fleet average. MOT data shows suspension failures at 124.8 times the fleet average, with components becoming corroded, damaged, or insecurely attached. The aluminium front subframe and steel suspension arms are particularly affected, with bushings, ball joints, and mounting points failing prematurely due to design and material choices.
Failed suspension components create a direct safety risk through loss of vehicle control, particularly during emergency manoeuvres. Subframe corrosion can lead to complete structural failure. Component replacement costs vary widely depending on which items have failed, but comprehensive suspension refurbishment can cost £2,000-£4,000.
Listen for knocking, clunking or rattling over bumps during the test drive. Inspect the underside for corroded or cracked suspension components. Check the MOT history for suspension-related advisories, which often predict future failures.
The RX-8 power steering system fails at 123.7 times the fleet average, primarily due to leaks in the hydraulic system. The power steering pump, high-pressure lines, and steering rack seals are particularly prone to failure, causing loss of steering assistance and potential safety implications.
Complete power steering failure makes the car difficult to control at low speeds and during parking. Continued driving with leaking fluid can damage the pump beyond repair. Steering rack replacement costs £800-£1,500 plus labour.
During the test drive, check the steering for excessive play, vibration or pulling to one side. Listen for groaning or whining when turning the wheel at low speed. Power steering fluid level and condition should be checked on hydraulic systems.
The RX-8 shows exceptionally high emissions failure rates, with levels exceeding limits at This is primarily due to the rotary engine's inherent design challenges with emissions control, catalytic converter degradation from apex seal wear, and secondary air injection system failures. The Renesis engine was specifically designed to meet emissions standards but remains problematic in this area.
Emissions failures prevent MOT certification and legal road use. Catalytic converter replacement costs £500-£1,500 per unit, and RX-8s have multiple cats. Secondary air injection system repairs add £300-£800. Continued driving with emissions failures may damage expensive components.
Check for any engine warning lights on the dashboard. Ask about the car's MOT emissions history — repeated failures suggest underlying issues. A pre-purchase diagnostic scan is especially worthwhile to check for stored emissions fault codes.
The RX-8 suffers from structural corrosion at The most common areas are rear wheelarches, sills, and door frames where water collects and drainage is inadequate. This is compounded by the car's age and the use of steel in areas prone to moisture retention.
Structural corrosion compromises the vehicle's crash safety and can make it uneconomical to repair. Severe cases result in MOT failure and potentially dangerous structural weakness. Professional bodywork to address structural corrosion typically costs £1,000-£3,000 depending on extent.
Inspect the wheel arches, sills, jacking points and door bottoms carefully. Press gently on sills to check for soft spots. Look underneath for corrosion on structural components. Check the MOT history for corrosion-related advisories or failures.
For the full breakdown of all 11 tracked issues with repair costs, see the Mazda RX-8 common problems page.
Check its dealer service history before you commit.
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Based on 21k real DVSA MOT tests, the Mazda RX-8 fails more often than average on several items. The biggest outlier is suspension ball joints worn at 125x the fleet average, followed by power steering fault (124x).
When viewing a specific car, check its MOT history for recurring advisories in these categories. See the full Mazda RX-8 MOT failure breakdown for data at every mileage point.
Routine servicing (oil and filter change every 6k miles) typically costs £80–£120 at an independent garage.
See the full Mazda RX-8 service schedule for every interval and cost breakdown.
The Mazda RX-8 has some well-documented weak points, including 2 safety-critical issues that demand careful checking. The right example, properly maintained, can still be a sound purchase — but cutting corners on the pre-purchase inspection is not advisable. 2008-2010 (Series 2 facelift with improved engine reliability, better refinement; R3 is the ultimate spec)
Before committing, check the car's full MOT history, verify the service record is complete, and if possible arrange a specialist inspection. Enter any registration into our free report to see the complete picture.
Get Car Wise maintains a database of known mechanical issues for every popular car on UK roads, tracking the faults that owners, specialists and DVSA data reveal.
When you run a report on a specific Mazda RX-8, we cross-reference the exact variant, engine and age against our database of 11 known issues. Combined with full MOT history analysis, mileage verification and DVLA data, you get a complete picture before viewing.
See every franchised dealer visit, dates, mileage readings, and work done. Know whether it's been properly maintained before you buy.
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This guide was compiled from independent expert reviews, DVSA MOT data, specialist workshops and our own database of 11 known Mazda RX-8 issues. We are not affiliated with any source listed.