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Mazda CX-7 2009: Engine failure

Asked by Adam Reed

Our 2009 Mazda CX7 MZR-CD has just had a major engine failure, just before its 120,000 km service. It has a full service history and was full of oil when it failed. I'm lead to believe that this isn't uncommon with these motors. Have you had heard of these engines having problems? We have the dealer extended warranty up to $3000, but the balance on a secondhand motor for replacement is $3000 on top of that. As the engine isn't old and has been looked after in accordance to Mazda's service regime I feel we should pursue Mazda Australia to pay for the replacement. Even if we replace the engine, how long would it last? Should it have oil changes more often than the service book says, as the dipstick has an 'X' mark above the full oil mark for when the oil gets to much diesel dilution! I'm not impressed that an engine can fail when everything has been done by the book.

Answered by CarsGuide

28 Apr 2017 Graham Smith

There have been a number of reports of engines failing because the oil has become contaminated with diesel fuel, so you're not alone there. I would urge you to request a goodwill payment from Mazda for at least part of the cost of a new engine. As your car is eight years old and has done 120,000 km you're unlikely to get a new engine from Mazda, but I think you have a good claim for a part payment. Once the engine is replaced I would suggest you change the oil more regularly than is recommended by Mazda.

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