The 2008 RX-8's Renesis rotary engine is a love-it-or-hate-it proposition: thrilling to drive but notorious for apex seal failure, carbon buildup, and oil consumption by design. Most examples at this age are nearing or past their first rebuild, and deferred maintenance accelerates catastrophic failure.
Apex Seal and Compression Loss (Engine Failure)
Common · high severity
Typical onset: 60,000-100,000 mi
Symptoms: Hard cold starts or no-start when engine is hot, Significant power loss, especially above 6,000 RPM, Failed compression test (below 6.9 kg/cm² per rotor face), Excessive blue smoke on deceleration
Fix: Full engine rebuild or replacement. Rotary specialists charge 20-30 hours labor for proper tear-down, resurface housings, replace apex/side/corner seals, bearings, and gaskets. Most owners opt for reman or used engine swap at 15-20 hours labor.
Estimated cost: $4,500-8,000
Carbon Buildup and Flooded Engine
Common · medium severity
Symptoms: Cranks but won't start, especially after short trips or shut-down before warmup, Rough idle and hesitation under 3,000 RPM, Fuel smell from exhaust, fouled spark plugs
Fix: De-flooding procedure: pull fuel pump fuse, hold throttle wide open, crank 10 seconds. Replace plugs and coils (common culprits). Carbon cleaning via Seafoam or manual removal requires 3-5 hours upper intake manifold removal. Coils and plugs together run 2 hours.
Estimated cost: $300-900
Ignition Coil and Spark Plug Failure
Common · medium severity
Typical onset: 30,000-60,000 mi
Symptoms: Misfires, especially trailing plugs (lower set), Check engine light with P0301, P0302, P0351-P0354 codes, Loss of power and poor fuel economy
Fix: RX-8 uses four coils and eight plugs (leading and trailing per rotor). Replace all coils and plugs as a set. Leading plugs accessible, trailing require upper intake manifold removal. Total 2-3 hours labor.
Estimated cost: $600-1,200
Engine Oil Consumption and Metering Pump Failure
Common · medium severity
Symptoms: Oil level drops 1+ quart per 1,000 miles (normal by design, but excessive if more), Increased carbon buildup and hot-start issues, No oil injection into combustion chambers (metering pump stuck)
Fix: Rotaries burn oil by design to lubricate apex seals. Metering pump replacement is 2-3 hours. Many owners add premix (2-stroke oil in fuel) as insurance. Verify pump operation with clear fuel line mod or pressure gauge test.
Estimated cost: $400-700
Starter Motor Failure
Occasional · medium severity
Typical onset: 80,000-120,000 mi
Symptoms: Clicking noise when turning key, no crank, Slow cranking, especially when hot, Intermittent no-start requiring multiple attempts
Fix: Weak starter common due to high compression cranking load and heat soak. Upgraded aftermarket units recommended. Removal requires 2 hours (tight access under intake manifold).
Estimated cost: $500-900
Catalytic Converter Failure
Occasional · medium severity
Typical onset: 70,000-110,000 mi
Symptoms: Rattling from undercarriage on startup, Check engine light P0420/P0421 (cat efficiency), Loss of power, sluggish acceleration
Fix: Rotary burns oil and runs rich, killing cats early. OEM cats are integrated into mid-pipe. Aftermarket high-flow or cat-delete mid-pipe is 1.5 hours labor. Must pass emissions in your state.
Estimated cost: $800-2,000
Clutch and Transmission Mount Wear
Occasional · low severity
Typical onset: 60,000-90,000 mi
Symptoms: Clutch slipping under load (manual transmission), Excessive shifter vibration or clunking on acceleration (worn mount), Difficulty engaging gears
Fix: 6-speed manual clutch job is 6-8 hours (gearbox removal). Transmission mount replacement is 1 hour. Many replace clutch, flywheel, and rear main seal together.
Estimated cost: $1,200-2,200
Owner tips
Always let the engine reach full operating temp before shutting down — short trips kill rotaries via carbon buildup and flooding.
Check oil every fillup; add 5W-30 or 10W-40 as needed. Consider premix (4-6 oz 2-stroke oil per tank) for extra apex seal lubrication.
Replace ignition coils and plugs every 30k miles as preventive maintenance — cheap insurance against misfires and flooding.
Compression test every 20-30k miles: healthy rotors should show 7.5+ kg/cm² per face with less than 10% variance between faces.
Drive it hard regularly (redline in lower gears) to burn off carbon — rotaries hate being babied.
Only buy if you're a rotary enthusiast willing to perform frequent maintenance and budget for an eventual $5k+ rebuild — most 2008 examples are ticking time bombs without documented compression tests.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.
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AIR BAGS:FRONTAL:PASSENGER SIDE:INFLATOR MODULE · 18V402000
2018-06-15 · EA15001
Mazda North America Operations (Mazda) is recalling certain 2003-2008 Mazda6, 2006-2007 Mazdaspeed6 and 2004 MPV vehicles nationwide. Mazda is also recalling 2005-2006 MPV vehicles in Alabama, Arizona, Arkansas, California, Delaware, the District of Columbia, Florida, Georgia, Hawaii, Illinois, Indiana, Kansas, Kentucky, Louisiana, Maryland, Mississippi, Missouri, Nebraska, Nevada, New Jersey, New Mexico, North Carolina, Ohio, Oklahoma, Pennsylvania, South Carolina, Tennessee, Texas, Virginia, West Virginia, Puerto Rico, American Samoa, Guam, the Northern Mariana Islands (Saipan), and the U.S. Virgin Islands.
On July 9, 2019 this recall was expanded to include certain 2004-2011 RX-8 vehicles that were previously recalled under 16V-354 but have not yet been repaired.
These vehicles are equipped with certain air bag inflators assembled as part of the passenger frontal air bag modules, and used as original equipment or replacement equipment. In the event of a crash necessitating deployment of the passenger frontal air bag, these passenger air bag inflators may explode due to propellant degradation occurring after long-term exposure to absolute humidity and temperature cycling.
Consequence: An inflator explosion may result in sharp metal fragments striking the driver or other occupants resulting in serious injury or death.
Remedy: Owners are advised not to drive their vehicles until the remedy is performed. Mazda will notify owners, and dealers will replace the front passenger air bag inflator with an alternate inflator, free of charge. The recall began July 6, 2018. Mailing to the affected RX-8 owners began July 6, 2019. Owners may contact Mazda customer service at 1-800-222-5500, option 4. Mazda's number for this recall is 2618F. Note: With the addition of the RX-8 vehicles, this recall fully supersedes recall 16V354.
AIR BAGS:FRONTAL:PASSENGER SIDE:INFLATOR MODULE · 18V404000
2018-06-15 · EA15001
Mazda North America Operations (Mazda) is recalling certain 2005-2006 Mazda MPV vehicles sold, or ever registered, in the states of Alaska, Colorado, Connecticut, Idaho, Iowa, Maine, Massachusetts, Michigan, Minnesota, Montana, New Hampshire, New York, North Dakota, Oregon, Rhode Island, South Dakota, Utah, Vermont, Washington, Wisconsin, and Wyoming.
On July 9, 2019 this recall was expanded to include certain 2005-2009 RX-8 vehicles that were previously recalled under 17V-011 but have not yet been repaired.
These vehicles are equipped with certain air bag inflators assembled as part of the passenger frontal air bag modules used as original equipment or replacement equipment. In the event of a crash necessitating deployment of the passenger frontal air bag, these inflators may explode due to propellant degradation occurring after long-term exposure to absolute humidity and temperature cycling.
Consequence: An inflator explosion may result in metal fragments striking the vehicle occupants resulting in serious injury or death.
Remedy: Mazda will notify owners, and dealers will replace the front passenger air bag inflator with an alternate inflator, free of charge. The recall began July 6, 2018 for MPV vehicles. The recall began July 9, 2019 for RX-8 vehicles. Owners may contact Mazda customer service at 1-800-222-5500, option 4. Mazda's number for this recall is 2618F. Note: With the addition of the RX-8 vehicles, this recall fully supersedes recall 17V-011.
AIR BAGS:FRONTAL:DRIVER SIDE:INFLATOR MODULE · 17V474000
2017-07-26 · EA15001
Mazda North American Operations (Mazda) is recalling certain model year 2003-2008 Mazda6, 2004-2008 RX-8, and 2006-2007 Mazdaspeed6 vehicles. The affected vehicles are equipped with a dual-stage driver frontal air bag that may be susceptible to moisture intrusion and other factors, including manufacturing variability that, over time, could cause the inflator to rupture.
Consequence: In the event of a crash necessitating deployment of the driver's frontal air bag, the inflator could rupture with metal fragments striking the driver or other occupants resulting in serious injury or death.
Remedy: Owners are advised not to drive their vehicles until the remedy is performed. Mazda will notify owners, and dealers will replace the driver's frontal air bag inflator with an alternate inflator, free of charge. The recall began on September 12, 2017. Owners may contact Mazda customer service at 1-800-222-5500. Mazda's number for this recall is 1417G. Note: This recall supersedes recall 15V-382.
Mazda North America Operations (Mazda) is recalling certain model year 2004-2008 RX-8 vehicles. Heat from the engine and the exhaust may cause the main fuel pump pipe to crack.
Consequence: If the fuel pump pipe cracks, fuel may leak, increasing the risk of a fire.
Remedy: Mazda will notify owners, and dealers will replace the fuel pump filter kit, free of charge. The recall began on July 31, 2017. Owners may contact Mazda customer service at 1-800-222-5500. Mazda's number for this recall is 1017E.
Mazda North America Operations (Mazda) is recalling certain model year 2004-2008 RX-8 vehicles manufactured April 10, 2003, to February 18, 2008. The affected vehicles have fuel pump sealing rings that may deteriorate due to exposure to heat from the engine or exhaust pipe.
Consequence: The deteriorated seals may leak fuel, which, in the presence of an ignition source, can increase the risk of a fire.
Remedy: Mazda will notify owners, and dealers will replace the fuel pump sealing ring set and add a thermal insulation pad to the fuel tank, free of charge. The recall began July 31, 2017. Owners may contact Mazda customer service at 1-800-222-5500. Mazda's number for this recall is 0516J.
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