Engine oil OEM Mazda or MOTUL

Motul 5w40 X-cess, suggested by multiple reputable indies.

I use Motul classic 20W-50 in all of mine, or some generic 20W-50 oil if I can't find it. If I'm not incorrect the classic has some additives to help with not seeping out of the engine but other than that won't do anything special.

I see a lot of people recommending lighter oils but living in a warm climate this is what works for me.

I run 5w-40 in everything. Mazda Skyactiv, Toyota 3UR, Honda J35. They all like it and run quiet.

Motul Xclean EFE 5w30, Xclean gen2 5w40

That said, I use Motul 0W20 in the winter and 5W30 in the summer.

I send an oil sample to Blackstone Labs every single time I change the oil or the dealer changes the oil. As part of that analysis, I pay the few extra bucks for a TBN calculation. On my SQ5 and S3, after running a fill for 10k to 12k, those TBN values always come back greater than 1.0 indicating that there’s still enough remaining additives to continue running that fill for even more miles still.

I just run Motul. 7100/7200 or the 300v.

Years ago I went down the oil rabbit hole and now I recommend motul 7100 4T

Now if you were to get Motul 300V, there would be a real difference there. Higher end “boutique” oils have additives, such as esters that will build up a film on moving parts over time, adding a layer of protection if for some reason you were to lose oiling to that part.

I just put in Motul 8100 instead of whatever the dealer was using. Haven't really noticed a difference except it's occasionally burning a bit, but I can't say for sure that it's just because of the oil.