I have walker mowers and been running 5/30 Mobil 1. I’m hearing that a 15/40 may be better for a small engine? I live in Maine so temp varies from 50-95 degrees outside when I use the mowers. Any help and advice on engine oil would be greatly appreciated, Thank you.
Mobil 1 5w30 is ILSAC passenger car oil NOT outdoor power equipment oil.
But as you know its hard to find a HD 10W30 for a reasonable price and most "lawnmower oils" in those under a quart bottles at the big box store are just rebranded ILSAC motor oil now. The "go-to" 10w30 rotella triple protect dino used to everywhere and I don't see it anywhere now. Its supposed to be available.
look here: https://rotella.shell.com/en_us/pro...c37c30ccd59eff9f869a06e1df/t4-10w-30.pdf
Low power walk behind mowers do well on most anything, but if you want the engine to outlast the deck x2, then a 4T motorcycle oil or ATV oil May do the trick if you wanted something "more" than an oil for water cooled motorcars.
Actually walk behind mowers are easy to lube, it's the splash lubed Snowthrowers that can be a challenge as the oil must be thin enough to splash lube in sub-zero starts but viscous enough at high temps to maintain a "cushion"
I had found Yardman/ MTD 5w30 synthetic snowthrower oil blended in louisianna at Lowe's years ago but haven't seen it lately.
This is a API SH high-ash additised Winter multigrade oil made with premium basestocks.
A VERY rare bird.