i always bring in my own 3 quarts of mobil1 for an oil change and tell the dealership not to top off as i will add another half quart later. while checking the oil level before adding to a recent oil change, i noticed petrol smell to the dipstick oil. does this mean the mechanic just kept my mobil 1 and pumped in whatever dyno oil they had? the level does come to the expected halfway between min and max. does dyno oil smell like gasoline? mobil 1 sure doesn't smell like whatever's in my car.