2010 MAZDA RX-8

Typical onset: 60,000-100,000 mi

Symptoms: Hard starting, especially when hot, Loss of compression (below 6.5 kg/cm² per rotor face), Excessive oil consumption (more than 1 quart per 500 miles), Rough idle and poor low-end power, White or blue smoke from exhaust on startup

Fix: Complete engine rebuild or reman replacement required. Apex seals wear prematurely if owner doesn't let engine warm fully or revs below 3,000 rpm constantly. Carbon buildup accelerates wear. Rebuild includes new apex seals, side seals, rotor housings if scored. 16-24 labor hours for removal, rebuild, reinstall.

Estimated cost: $4,000-7,000

Typical onset: 30,000-60,000 mi

Symptoms: Misfires and CEL with codes P0300-P0302, Flooding after short trips or failed hot starts, Hesitation under acceleration, Difficulty starting after sitting

Fix: Rotary engines run rich and carbon-foul plugs quickly. Leading and trailing coils also fail frequently due to heat. Replace all four coils and plugs as a set every 30k miles preventively. 2-3 hours labor. Use OEM Mazda coils—aftermarket units fail within months.

Estimated cost: $600-900

Typical onset: 50,000-80,000 mi

Symptoms: CEL with P0420 catalyst efficiency code, Rattling from underneath at idle, Loss of power and poor fuel economy, Sulfur smell from exhaust

Fix: Rotary engines inject oil into combustion chamber by design, which eventually clogs and destroys the cat. Requires OEM or high-flow aftermarket replacement. 3-4 hours labor. Often discovered when diagnosing rough running—check cat before condemning engine.

Estimated cost: $800-1,500

Symptoms: Cranks but won't start after being shut off cold, Strong fuel smell from exhaust, Wet spark plugs after failed start attempts, Happens after moving car short distance in driveway/parking

Fix: Rotaries flood easily if shut down before reaching full operating temp. Deflood procedure: remove fuel pump fuse, hold throttle wide open, crank 8-10 seconds. Replace plugs if saturated. Prevention: never shut off until coolant reaches 180°F+. 1 hour labor if plugs need replacement.

Estimated cost: $100-200

Typical onset: 70,000-110,000 mi

Symptoms: Accelerated apex seal wear, Low oil level without visible leaks, Rough running and loss of power, Carbon buildup visible in intake ports

Fix: OMP injects 2-stroke oil into combustion chambers for apex seal lubrication. When it fails or lines clog, seals wear catastrophically fast. Test OMP flow at throttle body ports. Replacement involves manifold removal. 4-5 hours labor. Some owners premix 2-stroke in fuel as insurance.

Estimated cost: $800-1,200

Typical onset: 60,000-100,000 mi

Symptoms: Slow cranking or clicking when hot, Starts fine cold, fails after heat-soaking, Grinding noise during engagement, Intermittent no-start after shutting off hot

Fix: Starter mounted close to exhaust manifold and heat-soaks after shutdown. Fails more often than typical cars. Requires replacement, not rebuild. 2-3 hours labor—tight access under intake manifold area. Upgrade to gear-reduction style helps longevity.

Estimated cost: $500-800

Typical onset: 80,000-120,000 mi

Symptoms: Red fluid puddles under engine bay, Transmission slipping or delayed engagement when hot, Low ATF level on dipstick, Lines corroded or cracked at fittings

Fix: External cooler lines for 6-speed auto rot at connections. Manual transmission doesn't have this issue. Replace lines and top off fluid. 1.5-2 hours labor. Check whenever doing spark plugs—easy to spot early.

Estimated cost: $300-500