Engine oil Castrol or OEM Mazda

Castrol/Mobil1 5W-40. On my JK I change it every 7000 kilometres MAX

the regular castrol gtx high mileage green bottle. I used to use it for a kia rio same as accent and the burning went down a lot

I use 5w-30 Castrol and she runs like a

Dream.

I use Castrol Edge 5W30 LL04 (M). I doubt what you read about sludge is true. Regular oil and filter changes are way more important than which brand you use.

i use castrol 5w-40 european vehicle. fully built and no issues at almost 30k

I use the Castrol Edge oil. I was doing 7500 mile oil changes and on this last one bumped that up to 10k miles. I sent out the oil for analysis to decide if I want to step up to an even larger interval. The comments left by the tester: 'Your CX5's engine looks good in analysis! Your results look really good by comparison after the 10,000 miles. Metals are all within good wear ranges, with iron even showing below-average steel wear. Nice! Titanium is just an additive in Castrol. Very nice! Go 12k miles next fill.' I will heed their advice and go 12,000 miles on this next one.

Castrol German 0w/5w-40

Doesn’t sheer down…

I used Castrol edge cos that's what my audi used from the factory.

Mazda’s OEM 5w30 is a little too thin for my blood considering the engine temps when driving hard, fine if you’re going to never redline the car

Dude omg yes. I work at O'Reilly's and this castrol pisses me off.