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Mazda
RX-8
SE·
2003-2012
coupe
Caution
Price (AUD)
$6k-$25k
Body styles
4-door coupe (freestyle/suicide rear doors)
Drivetrain
Rear-wheel drive
Origin
Japan
Built in
Japan
Overview
The RX-8 (chassis SE3P) was Mazda's last rotary sports car, sold in Australia from 2003 to 2012 across a Series I (2003-2008) and a facelifted Series II (2008-2012). Power comes from the naturally aspirated 1.3L 13B-MSP 'Renesis' twin-rotor Wankel - a genuinely unique, free-revving (9000rpm) engine with near-50:50 weight distribution, a low bonnet line and rear-hinged 'freestyle' rear doors. Australia got two distinct states of tune tied to the gearbox: the high-power 6-port engine with the 6-speed manual (177kW Series I, 170kW Series II), and a lower-output engine paired with the automatic (4-speed/141kW in Series I, a far better 6-port 6-speed Activematic/158kW in Series II). The driving experience is superb, but ownership is defined by the rotary's frailties - apex seal wear and lost compression (often by 100,000-150,000km), hot-start flooding, weak Series I starter motors, heavy oil and fuel consumption (it BURNS oil by design - you must top it up), tired ignition coils and clogged cats. Buy one only with eyes open, a compression test in hand, and a rotary specialist on speed-dial; a healthy, well-maintained example is a joy, a neglected one is a money pit.
Engines & variants
1.3L 13B-MSP Renesis (high-power, 6-speed manual)
Engine
1.3L naturally aspirated twin-rotor Wankel (Renesis), high-power 6-port intake
Config
Twin-rotor Wankel NA
Displacement
1308cc (2 x 654cc rotor)
Power
177kW @ 8200rpm (Series I) / 170kW @ 8200rpm (Series II)
Torque
216Nm @ 5500rpm (~211Nm Series II)
Drivetrain
Rear-wheel drive
Economy
12-15 L/100km real world (premium 95/98 RON)
Transmission
6MT
Timing chain / belt / gear
No belt/chain/gear cam train - Wankel rotor geometry; eccentric shaft drives rotors directly
Pros
- The proper RX-8 - free-revving high-power 6-port engine to a 9000rpm redline
- Sublime chassis balance, sharp steering, near 50:50 weight distribution
- Tactile 6-speed manual is the engaging, sought-after combination
- Cheap to buy for the performance and presence on offer
Cons
- Apex seals wear and compression fades, commonly by 100,000-150,000km
- Hot-start flooding can strand the car and kill the starter
- Series I (2004-2006) starter motors are weak and recall-affected
- Burns oil by design and drinks premium fuel - high running costs
Known problems
high
Apex seal wear / loss of compression
The Renesis's apex seals wear and the rotor faces lose compression, giving hard hot-starting, rough idle, sluggish acceleration and eventual no-start. Many engines need a rebuild between 100,000 and 150,000km; a poorly maintained one can fail well earlier.
Fix: Compression test (rotary tester, not a piston gauge) before buying; full engine rebuild with new seals by a rotary specialist (e.g. Mazfix/RotorMaster). Regular oil top-ups, premium fuel, warm-up discipline and frequent oil changes prolong seal life.
high
Hot-start flooding
Shutting the engine down before it reaches operating temperature dumps unburnt fuel into the chambers and floods it, leaving the car hard or impossible to restart and hammering the starter. A classic, well-documented RX-8 trait.
Fix: Always let it reach temperature before shutting off; clear a flood via the de-flood/WOT crank procedure or by pulling plugs. Healthy ignition (coils/plugs) and a strong battery reduce the risk.
medium
Ignition coils, plugs and leads
Rotaries are hard on ignition. Tired coils, plugs and leads cause misfires, poor starting, lost power and - if left - extra fuel burning out the catalytic converter.
Fix: Treat ignition as routine maintenance - replace coils, plugs and leads on a service schedule; many owners fit upgraded coils.
1.3L 13B-MSP Renesis (automatic)
Engine
1.3L naturally aspirated twin-rotor Wankel (Renesis); 4-port/lower-output auto tune (Series I 4-speed), 6-port (Series II 6-speed Activematic)
Config
Twin-rotor Wankel NA
Displacement
1308cc (2 x 654cc rotor)
Power
141kW @ 7000rpm (Series I 4AT) / 158kW @ 7500rpm (Series II 6AT)
Torque
222Nm @ 5000rpm (Series I) / ~211Nm (Series II)
Drivetrain
Rear-wheel drive
Economy
12-15 L/100km real world (premium 95/98 RON)
Transmission
4AT, 6AT
Timing chain / belt / gear
No belt/chain/gear cam train - Wankel rotor geometry; eccentric shaft drives rotors directly
Pros
- Easier daily driving than the manual; still a great-handling chassis
- Series II 6-speed Activematic (158kW) is a big step up from the old 4-speed
- Cheapest entry into RX-8 ownership
- Lower-stress tune is a touch easier on the engine for relaxed driving
Cons
- Series I 4-speed auto (141kW) is the slowest, least desirable RX-8
- Same apex-seal and flooding rotary risks as the manual
- Auto blunts the engine's high-rev character
- Lower power but no better fuel economy
Known problems
high
Apex seal wear / loss of compression
Like all Renesis engines, the auto loses compression as apex seals wear, producing hard hot-starts, rough running and eventual failure - typically 100,000-150,000km, earlier if oil top-ups and warm-ups were neglected.
Fix: Rotary-specific compression test pre-purchase; rebuild with new seals by a rotary specialist. Diligent oil top-ups, premium fuel and frequent oil changes are essential.
high
Hot-start flooding
Shutting down before operating temperature floods the chambers with fuel, causing hard or no restart and straining the starter - the signature RX-8 ownership headache.
Fix: Reach operating temperature before switching off; use the de-flood procedure when it happens; maintain strong battery and healthy ignition.
medium
Weak starter motor (Series I)
Early Series I cars used an underspecified starter that struggles, especially when warm or after a flood; a 2006-era recall/upgrade addressed it but many cars still wear the original.
Fix: Fit the upgraded/uprated starter; address flooding habits that overwork it.
medium
Catalytic converter clog / failure
Misfires from worn ignition components, or oil/fuel passing through, overheat and clog the cat, causing power loss and limp performance - and a clogged cat can feed back heat into the engine.
Fix: Keep ignition healthy to prevent it; replace the catalytic converter (aftermarket/high-flow options common in the AU rotary scene).
Common problems (all variants)
high
Oil consumption (by design) and undiscipline killing the engine
The Renesis deliberately injects engine oil into the combustion chambers to lubricate the rotor seals, so it genuinely consumes oil between services. Owners who don't check and top up the oil starve the seals and dramatically shorten engine life - the single biggest cause of premature failure.
Fix: Check oil every 1000-2000km and top up; use quality oil and short oil-change intervals. Some owners add a premix or upgrade the oil metering. Treat oil level as a constant duty, not a service-only item.
low
Poor fuel economy and premium-fuel requirement
Rotaries are thermally inefficient - real-world 12-15 L/100km on 95/98 RON premium is normal and not a fault. Range and running cost are poor for a 1.3L.
Fix: Accept the fuel bill as part of rotary ownership; it is inherent to the engine.
medium
Cooling system and overheating risk
The Renesis runs hot and is sensitive to cooling health. Tired radiators, hoses and thermostats raise the risk of overheating, which accelerates seal and housing wear.
Fix: Keep the cooling system fresh (radiator, hoses, coolant, thermostat); fit a quality radiator and monitor temps, especially for track use.
low
Suspension bushes, brakes and tyres
As an ageing sports coupe, the RX-8 wears front control-arm and rear bushes, brake rotors/pads and tyres - more so on enthusiast-driven or tracked cars.
Fix: Standard sports-car maintenance; refresh bushes, brakes and a wheel alignment to restore the sharp handling.
medium
Dual-mass flywheel / clutch (manual) and auto wear
High-revving use wears the clutch and dual-mass flywheel on manual cars; the older 4-speed auto can also feel tired with age.
Fix: Replace clutch with flywheel as a set; service/inspect the auto and confirm clean shifts pre-purchase.