Buy Castrol Edge engine oil for your Mazda 2.5, but do get the Mazda transmission oil.
I\u2019ve always preferred Castrol gold.
In my 323i with the 2.5L N52 engine, I use Castrol Edge 5w40 with the appropriate LL specification. Oil consumption is 3000 km per liter, with 190,000 km on the clock.
Castrol is really good considering cost and quality.
I prefer synthetic myself in my CX50 Turbo, but Mazda engines aren't very picky overall.
I replaced the plugs, oil/filter and air filter with oem parts when I got it. I\u2019ve been changing the oil at 5k intervals with the recommended Castrol 0w-20.
I run Castrol (bought at Walmart), like my father and his father did before me...
I use it in my non deleted CJAA (dumb) but I haven't had any issues (yet) and it doesn't burn oil.
Castrol is fine
It\u2019ll be okay. Subaru engines are robust and that mix rate won\u2019t increase the viscosity enough to affect the oil flow rate out to the cams.\nPardon my skepticism regarding Castrol oils though. Haven\u2019t been a fan of them since the GTX days. The additives they\u2019d chuck in their generically sourced base oils glazed bores and gummed lifters.\nCost many a machine shop like ours a fortune in comeback work.
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