Yo uso Valvoline 15w40 semisintético y no he tenido problemas, es una de las marcas que recomienda el manual de mi carro.
We've been running the valvoline restore and protect oil lately in our fleet of cars and have nothing but positive things to say. Slowed down some oil burning on our high mileage scion TC and no complaints from our other vehicles, including my turbocharged 200k mile 09 focus.
Idemitsu is responsible for the oil that powered the Mazda 787b; they know the rotary like no other. I exclusively use their synthetic 20w50 and premix.
Regarding brands, if you want to stick with factory oil without dealer price, Idemitsu is the brand to get. I emailed Mazda corporate and they said Idemitsu is the OEM for their oil.
I was a diehard Mobil 1 Extended Protection guy, but fell into the hype about Valvoline Restore & Protect. Tried it on my 2015 Mazda6 2.5 with 95k miles and have to say I'm impressed. I bought it used, it was using about a quart every 3k maybe, and had some blowby. Otherwise ran good, had several 40+ mpg tanks.
Switched to R&P, after 1k the blowby went away and after 3k it looks like it stopped burning oil.
Mobil 1 "eh" oil. It's okay, not bad like royal purple but better off on Vavoline or Pennzoil. Also Motul but that's expensive shit. Amsoil is okay, it's one step above OEM.
My 2007 camry is on 22k km (engine 2AZ-AE). No oil burning so far. Always been using penrite 5w-30 while servicing between 5000 to 8000. Only one time had burning smell while running engine on Valvoline 10W-30. Changed the oil at 3k, after that smooth as it was.
Valvoline full syn high mileage and black OEM filter - 113k miles and it doesn’t eat any between changes.
Eh if it’s VW approved then it’s fine. I just use Castrol Euro or Valvoline Euro and haven’t had any issues.
I refill about 1/2 qt of oil every 2500 miles.
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