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Mazda CX5 2014 done 164000km , had to have engine replaced $14000
Surely a diesel engine should last longer - regular servicing , can you tell me how common this is and whether I should chase a refund thru small claims

Hello, its difficult to determine why the engine has failed prematurely however we have heard of oil dilution problems in some diesel Mazda models this may be worth investigating.
If you wish to dispute this matter with a dealer more info on your rights can be found here...

https://www.consumerprotection.govt.nz/help-product-service/cars/solving-issues-car-dealer/