Was looking for the normal sized, pre-measured bottles of Toro oil for my mower because it's easier to just put the entire bottle in without having to check the level, then add small amounts until it's right, or measure out the correct amt. Well, local store was out but they had these smaller bottles which two was about the same volume. We were in a hurry and I didn't read the label closely, just saw 30 and the size. My engine is not a "never change the oil" model, but I was curious if there really is any difference in the formulation vs. the "non-topoff" oil. Same viscosity, SAE30