Mazda 6 GJ

2.2-litre SkyActiv-D with extremely low compression ratio (14:1) for a diesel. Clean combustion without a NOx storage catalytic converter, long-lived with regular oil changes.

• !! Camshaft Seized from 80,000 km

  Insufficient surface hardening of the exhaust camshaft leads to heavy wear with metal particles in the oil. Secondary damage to the vacuum pump and turbocharger is possible. Primarily affects build years 2012–2015.

  Symptoms: Warning 'Low oil pressure – engine damage possible', fault code P0056F, jerky gearbox, metal particles visible in oil on change.
  500–5,000 $
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• !! Severe Oil Dilution from Fuel Ingress from 30,000 km

  DPF regeneration injects fuel into the cylinder, which passes the piston and enters the oil. Dilution rates of up to 20–25% are possible. Increased engine wear and turbocharger bearing damage can follow.

  Symptoms: Oil level rises above MAX mark, fuel smell in oil, onboard computer shortens oil change interval, up to 20% diesel detectable in oil analysis.
  100–400 $
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• !! Leaking Injector Seals from 100,000 km

  Failed flame protection seals on the injectors allow hot combustion gases into the oil system. The oil cokes up and blocks the oil sump strainer, leading to pressure loss and engine damage.

  Symptoms: Rapidly ageing oil with fuel smell, elevated oil consumption, engine oil warning light, in severe cases oil pressure loss and piston damage.
  400–8,000 $
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+ 4 more engine weaknesses + vehicle weaknesses

2.0-litre SkyActiv-G with 13:1 compression ratio and chain drive. Core engine of the SkyActiv fleet with a wide power range from 88 to 121 kW.

• !! Carbon build-up on intake valves from 110,000 km

  Direct-injection carbon build-up on intake valves from crankcase breather oil mist. Typically occurs between 100,000–160,000 km. Walnut blasting is the only lasting solution.

  Symptoms: Rough cold start with misfire codes P0300–P0304, sluggish throttle response, increased fuel consumption
  185–800 $
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• !! Low oil pressure — oil pump pressure relief valve from 80,000 km

  Particularly on early build years 2012–2014, contamination in the oil pump pressure relief valve can reduce oil pressure. Persistently low oil pressure accelerates bearing wear considerably.

  Symptoms: Oil pressure warning light illuminates, knocking noises from the engine, increased engine noise at low revs
  350–700 $
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• ! Defective coolant control valve (thermostat)

  A manufacturing deviation in the electric coolant control valve allows coolant to enter the dry chamber. The valve opens too early. TSI R054-21 affects all SkyActiv-G engines.

  Symptoms: Extended warm-up phase, blue coolant warning light, poor heater output at idle
  150–400 $
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+ 3 more engine weaknesses + vehicle weaknesses

2.5-litre SkyActiv-G naturally aspirated engine with cylinder deactivation from 2018. Top of the naturally aspirated range with strong pull.

• !! Cylinder Head Crack (Exhaust Side) from 60,000 km

  Micro-cracks form on the exhaust side of the cylinder head due to thermal stress. Primarily affects 2019–2020 CX-5 and Mazda6. Mazda extended the warranty to 10 years/120,000 miles. Revised head design from 2021.

  Symptoms: Sweet coolant smell after shutdown, dropping coolant level with no visible puddle, steam from engine bay
  2,000–8,000 $
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• !! Recall: Cylinder Deactivation Valve Lash Adjuster

  PCM software incorrectly controls hydraulic valve lash adjusters during the transition out of cylinder deactivation. Intake valve rocker arm can contact engine components. CX-5 KF 2017–2019, approx. 58,000 vehicles in Europe.

  Symptoms: Misfires, power loss, rough running when upshifting out of cylinder deactivation
  0–0 $
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• !! Fuel Pump Impeller Fracture

  Recall for 2019–2020 CX-5: the low-pressure fuel pump impeller can fail due to cracking. Mazda notified owners in November 2021. Engine stall possible.

  Symptoms: Engine won't start, power loss, irregular engine running, engine warning light
  300–800 $
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+ 3 more engine weaknesses + vehicle weaknesses