I have a 2007 Mazda 3 GX which I just took in for an oil change @ Canadian Tire. On the receipt they wrote down the filled it up with 5w30 oil. I was looking through my manual today and under the maintenance section I noticed it said to use 5w40 oil. I don't know that much about cars and I was wondering if I should worry about this or if everything is okay? When I took my car in they never asked me what type of oil so I assumed they would have some sort of a reference lookup to inform them based on type of car.
Thanks
Thanks