I've used it for about 25k miles in my Camry with the 2AZ-FE engine (200k miles on it), it has the known issue with the piston rings being poorly engineered and seize up from excessive oil burning. I can personally confirm it has cleaned up my pistons, I haven't taken the engine apart so can't directly see the rings but oil consumption has reduced from 1 qt per 1k miles to now 1qt per 5k miles.
It sure does work, cleaning dipsticks and reducing oil burn has been my experience on several personal cars since starting a year ago. I bought an MDX burning almost 1 quart oil / 1k at 155k, now doesn't use a half quart every 3k now at 185k.
Buy Castrol Edge engine oil for your Mazda 2.5, but do get the Mazda transmission oil.
I've been using valvooine max life for a long time and it's done me just fine.
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.
I have been using various Valvoline synthetic oils 10+ years in multiple stationary engines, tractors, diesel and petrol engines. No sludge, no varnish inside the engines, and never worn an engine out.
Castrol is really good considering cost and quality.
I went to Valvoline once, oil pan emptied itself onto their floors the moment I started the engine. Joking aside I think it's perfectly fine to go to Valvoline, I go there often bringing my own oil and filter, that way I know it's the right oil and it's good quality stuff.
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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