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- 2022 2.5GT
The quality of diesel fuel should be irrelevant to overheating problem.
Taiwan is not a small 80 X 60 km island and there's a Mazda branch office there with good dealer network. The overheating complaints from those CX-5 owners have been using Mazda dealers for routine maintenance, or Mazda dealers would easily use that as an excuse not to do anything for their overheating or blown head gasket problems. Mazda Taiwan has stopped selling its most popular diesel models for 2019, and why is that?
No it hasn’t.
https://www.mazda.com.tw/cars/mazda-cx-5/features/performance/