Mazda Rx-8 Years to AvoidThe weakest years — and the one you should buy instead

Apex seals and side seals wear prematurely, leading to a critical loss of compression and eventual engine failure. This is often exacerbated by poor ignition or inadequate oil metering. Hot start issues are a primary indicator.

Ignition coils, spark plug wires, and spark plugs wear out rapidly in the RX-8 due to the high temperatures and unique combustion cycle. Failed components lead to misfires, reduced power, poor fuel economy, and can accelerate engine wear or catalytic converter failure.

Excessive oil consumption and unburnt fuel (often from misfires) can clog, overheat, or melt the catalytic converter. A failed catalytic converter can restrict exhaust flow, damage the engine, and is expensive to replace.

Apex seals fail, leading to significant compression loss and hard starting, particularly when hot. Carbon buildup exacerbates wear. Oil control rings can also fail, leading to excessive oil consumption beyond the already high normal rate.

Ignition coils (often the 'B' coils), spark plugs, and plug wires are notoriously weak and prone to premature failure. This causes misfires, reduced power, poor fuel economy, and crucially, premature failure of the catalytic converter.

Prone to failure due to unburnt fuel from the faulty ignition system. A clogged or failed catalytic converter can cause significant power loss and even damage the engine by increasing backpressure.

The Renesis rotary engine is highly susceptible to apex seal wear, carbon buildup, and oil control ring issues, leading to catastrophic compression loss. This often manifests as difficult hot starts, misfires, and eventually complete engine failure. Neglecting oil levels or using improper oil accelerates wear.

The ignition coils, spark plugs, and plug wires are notorious for premature failure. Worn coils provide weak spark, leading to misfires, unburnt fuel entering the exhaust, and subsequent damage to the catalytic converter. This issue contributes significantly to engine carbon buildup and overall poor performance.

Due to the rotary engine's tendency to consume oil and the ignition system's propensity for misfires, unburnt fuel and oil residues frequently clog and destroy the catalytic converter. A failed catalyst reduces power, increases exhaust backpressure, and can further damage the engine.

Apex seals wear prematurely, leading to a loss of compression, poor hot starting, excessive oil consumption, and eventual engine failure. Carbon buildup is also a significant issue.

Ignition coils, spark plugs, and plug wires are notorious for failing frequently, exacerbating carbon buildup and potentially leading to catalytic converter damage and engine misfires.

Due to the engine's inherent oil consumption and misfires from a failing ignition system, the catalytic converter often becomes clogged or fails prematurely.

The Renesis 13B-MSP rotary engine is prone to apex seal wear and carbon buildup, leading to a loss of engine compression. This manifests as difficult hot starts, misfires, reduced power, and eventually complete engine failure. Neglected ignition components accelerate this issue.

The RX-8's ignition components (spark plugs, ignition coils, and wires) are subjected to extreme heat and wear rapidly, typically failing much sooner than in a piston engine. Faulty ignition system leads to poor combustion, misfires, excessive carbon buildup, and critically, accelerated apex seal wear.

Due to the rotary engine's inherent characteristics, including high exhaust gas temperatures and potential for unburnt fuel, catalytic converters often fail prematurely. Failed cats can restrict exhaust flow, overheat, and even contribute to engine damage.

The Renesis rotary engine is notorious for apex seal wear, carbon buildup, and ultimately, loss of compression. This leads to hard hot starts, misfires, loss of power, and eventual engine failure. Premature wear is exacerbated by short trips, improper oil changes, and faulty ignition components.

Faulty ignition coils, spark plugs, and plug wires are a widespread issue. These components degrade rapidly due to the high heat and unique combustion characteristics of the rotary engine. Failure to replace these proactively leads to misfires, carbon buildup, catalytic converter damage, and accelerates apex seal wear.

Due to misfires from weak ignition and excessive oil consumption, the catalytic converter often fails prematurely by overheating and melting internally. A clogged or damaged cat restricts exhaust flow, causes power loss, and can even contribute to engine longevity issues. It's an expensive part to replace.

The Renesis rotary engine is prone to apex seal wear and carbon buildup, leading to critically low compression. This results in hard starting (especially when hot), misfires, severe power loss, and eventually, complete engine failure. This is not if, but when for many units.

Worn ignition coils, spark plugs, and spark plug wires are a very common issue, leading to misfires. These misfires dump unburnt fuel into the exhaust, rapidly destroying the catalytic converter. Neglecting ignition quickly leads to costly cat replacement and further engine damage.

The OMP injects oil directly into the combustion chambers for lubrication. Malfunctions can lead to either inadequate lubrication (accelerating engine wear) or excessive oil consumption. High oil consumption is normal for a rotary, but improper OMP function or excessive wear exacerbates it.

The Renesis rotary engine is highly susceptible to apex seal failure, excessive oil consumption, and carbon buildup, leading to loss of compression and eventual engine death. This is often exacerbated by improper warm-up/cool-down procedures, infrequent oil changes, or neglecting ignition system wear.

The coil packs, spark plugs, and plug wires are critical for proper rotary engine operation and are known to fail prematurely. Worn components lead to misfires, reduced power, poor fuel economy, and crucially, increased carbon buildup and accelerated engine wear.

Due to the rotary engine's high exhaust temperatures and potential for unburnt fuel, catalytic converters can fail prematurely, often melting internally and causing exhaust restrictions and further engine damage if not addressed. This is often a symptom of underlying ignition or engine health issues.