{"source":"NHTSA vehicle owner complaint","officialApiUrl":"https://api.nhtsa.gov/complaints/odinumber?odinumber=11754947","retrievedAt":"2026-11-05T03:28:58.341Z","count":1,"results":[{"odiNumber":11754947,"manufacturer":"Mazda Motor Corp.","crash":false,"fire":false,"numberOfInjuries":0,"numberOfDeaths":0,"dateOfIncident":"04/01/2026","dateComplaintFiled":"08/05/2026","vin":"JM3KFADM1K0","components":"ENGINE","summary":"My 2019 Mazda CX-5 with the 2.5L naturally aspirated SkyActiv-G engine with cylinder deactivation has developed a significant engine oil leak at the front of the engine, accompanied by a strong burning oil odor detectable both outside and inside the cabin. Mileage is approximately 50,000, averaging about 7,000 miles per year with all maintenance performed on schedule.  The burning odor indicates engine oil is contacting hot exhaust components, creating a fire hazard. I have stopped driving the vehicle.  I have taken the vehicle to two authorized Mazda dealers for this identical issue. One was unable to locate the source of the leak. The other quoted approximately $10,000 without providing a written diagnosis identifying the failed component. The vehicle is scheduled for a third dealer diagnosis on August 6, 2026. More than two weeks of dealer possession across two visits produced no identified cause.  Mazda has acknowledged cylinder head cracking in this engine family. CSP11 extends powertrain warranty coverage to 10 years/120,000 miles for cylinder head repairs on the 2.5T turbo engine, and TSB 01-002/23 addresses cylinder head leaks. Mazda also revised the cylinder head casting for the 2021 model year. However, owners of naturally aspirated 2.5L vehicles with the same casting failure have been denied coverage on the grounds that the leak involves oil rather than coolant, or that their VIN falls outside the covered range.  I request that NHTSA investigate cylinder head cracking in naturally aspirated 2.5L SkyActiv-G engines in 2018–2020 Mazda CX-5 vehicles. Numerous complaints describe the same pattern: oil leaking onto the exhaust manifold, burning odor and smoke, fumes entering the cabin, and failures at low mileage. This presents a risk of engine compartment fire and of sudden stalling from loss of oil pressure. The affected population appears substantially larger than the vehicles currently covered.","products":[{"type":"Vehicle","productYear":"2019","productMake":"MAZDA","productModel":"CX-5","manufacturer":"Mazda Motor Corp."}]}]}