Viscosity loosely relates to weight ... kept separate in a 4-stroke engine. Oil with a grade of SAE-30 is often a safe bet, but it’s still worth confirming since a lawn mower isn’t a small ...

Naturally, to get the most out of their performance, you will need engine oil that's on par with the mower's powerhouse. So, what kind should you use? Kawasaki lawn mower engines take 10W-40 ...