If that weight of oil were specified and this product certified by my vehicle's manufacturer, I'd have no reservations about running it. I've had outstanding service from Mobil 1 oils since my very first car, and every vehicle since. I've run other oils on occasion, but mostly Mobil 1 products. I doubt they are going to put an engine damaging oil or short lived oil on the market, particularly with the Mobil 1 brand behind it. If they were going to do that, they wouldn't put their name on it. They'd put Dollar General on it.