You might think “more oil = more love,” but your engine doesn’t see it that way. Overfill it, and the oil turns into foam—yes, foam—which is about as useful as a chocolate teapot. That foam can’t lubricate, so your engine starts chugging and eventually gives up.
How Much Oil Does A Husqvarna Push Mower Take at Patrick Lauzon blog
Underfill it, and you’re basically asking your mower to run on empty, which is like you trying to run a marathon without water. The sweet spot? Check the dipstick while the engine is cold and level. That’s your golden rule. Always fill to the “Full” line, not a drop more.
