Castrol 5W-40 Eurocar. I live in the northeast and park outside. Car has been solid and I've used this oil since I bought it. 65k miles later, I see no reason to make a change now.
Previous comments about mobil 1 are right it’s best for reliability - castrol are seen as high performance oils
5W-30 Castrol Edge. FPRS uses it and has had very few failures on stock motor cars. I was also running it in my GR86, and Blackstone came back perfect on that car.
For [Naturally-Aspirated Skyactiv engines](https://en.wikipedia.org/wiki/SkyActiv), it is highly recommended that you use Mazda's own(Idemitsu) high molly GF-5 0w-20. [Arguably it is one of the best oil for skyactiv engines]
Castrol in my daily driver. The daily would have a slight ticking when warming up with other brands, not with Castrol, so I been using it for over 100k with no issues.
Have a look on Amazon they do some good deals on oil, I normally stick it in my basket and wait for it to drop.
My old car was Castrol 5w30 Magnatec, £28.50 for 4l on Amazon £43.99 from euro.
Using Castrol EDGE Euro 5W-40 after watching a EN owner on YouTube suggested it. Car runs great in this 110 plus days in Texas
I did 100k on Castrol gtx in an f4i plus tens of thousands on other bikes using the same oil. I buy it in bulk and it goes in the whole fleet.
Australia here - they used 10w-30
Feedback from showroom
The 10w-30 is the best oil due to the Australian conditions
Castrol oil MAG
my vw eats full synthetic castrol 5w40. thats what the dealership recommended to me.
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