Change the oil at a minimum, and do it regularly. Use a quality synthetic high mileage oil and change it again in a couple thousand miles, then change on regular 5k mile intervals.
I have a 17 grand touring and I use idemitsu 0w/20 and purolator b9ss filters.
4.5 L is the Ideal for Mazda 6 2.5 non turbo, I'm from the same country as you. I'm using fuchs titan 5w30 for two years and I recommend you do the same, I noticed quieter engine.
No issues at 150k on my 6. I do not worry but do run pea type injector cleaner every 3-5k and use quality oil that helps prevent off gas issues like Mobil 1 and Valvoline
What brand oil are you using? I noticed a decrease in consumption with Mobil 1 and stuck with it.
they only say you can do that with their Mazda-branded oil. That stuff tends to be expensive.
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This part for Mazda 6 is made around the world. We have reviews for engine oil manufacturers from countries such as: Finland, Japan, USA, Germany .
In March 2026, the ranking of engine oil for Mazda 6 on PartReview included 5 manufacturers. It is based on 6 reviews and 18 votes.
Last month, PartReview users preferred Mobil. 16% of positive votes went to this manufacturer.
In second place: engine oil IDEMITSU — 16%.
Third place: VALVOLINE with 16% of the votes.
In the overall ranking of engine oil, which aggregates opinions of owners of different car makes and models, these brands hold the following positions:
After seeing which engine oil owners of Mazda 6 prefer, check other popular parts for this car. In March 2026, leaders on PartReview were:
