NHTSA Complaint #11694210 — 2018 MAZDA MAZDA6

ENGINE issue reported to NHTSA

Check any vehicle history by VIN - Free vehicle history report

Complaint Details

ODI Number	11694210
Vehicle	2018 MAZDA MAZDA6
Component	ENGINE
Date of Incident	October 11, 2025
Date Filed	October 17, 2025
Mileage	N/A miles
Crash	No
Fire	No
Injuries	0
Deaths	0
Vehicle Towed	No
State	OH

Consumer Description

Cracked cylinder head causing oil leak and possible coolant leak. This is a known issue with this year and model. Mazda is trying to suggest the issue is only for the turbo engine, but the non-turbo engine is also defective, per countless reports online. I have a video from the service technician from the mazda dealership, but it is too big to upload.

Related Complaints for the 2018 MAZDA MAZDA6

Other ENGINE Complaints

#11719756 — February 22, 2026 — Per Mazda inspection, the back side of cylinder head #3 has an oil leak which is leaking onto the exhaust manifold. T...

#11709431 — January 7, 2026 — I recently discovered a significant oil leak near the exhaust manifold of my 2018 Mazda 6 (2.5L NA), which has result...

#11659983 — May 9, 2025 — Bought used with 47k miles. Two weeks later, took it to my mechanic for an inspection, they found a massive oil leak ...

#11634788 — January 8, 2025 — Coolant leaks at the cylinder head around the exhaust manifold causing my car to over heat. Also when my thermostat i...

#11634029 — January 4, 2025 — Driving in traffic and the engine temperature warning appeared on dash. Dealer has confirmed there is a large coolant...

Recent Complaints for the 2018 MAZDA MAZDA6

#11709431 — POWER TRAIN — January 7, 2026 — I recently discovered a significant oil leak near the exhaust manifold of my 2018 Mazda 6 (2.5L NA), which has result...

#11688263 — POWER TRAIN — September 18, 2025 — Was driving then car suddenly shut down and all panel lights turned on. The car would not start after an hour it star...

#11663276 — SERVICE BRAKES — May 27, 2025 — Premature caliper failure on front and rear. Ruined rotors at 40k miles, confirmed caliper failure by two service sho...

#11660947 — FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP — May 14, 2025 — The contact owns a 2018 Mazda Mazda6. The contact stated upon taken the vehicle to the dealer for an oil change, the ...

#11646848 — SERVICE BRAKES — March 6, 2025 — I am having my brake pads changed at a local mechanic and when changing the pads, the mechanic was unable to change t...