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I heard an interesting story today on a Old Kohler fb page. I mentioned that I use Rotella 15w40 in all of my air-cooled 4 cycle motors and a fellow responded with this: as I understand it, the disadvantage of multi-viscosity oils in these engines is that it breaks down quickly and before long...

As long as I have a source near me for the GL-1 140, I will use that. Just trying learn what I can about this. I have written to one oil company, but in today's world, can their answer be trusted?

Yes, that is question with the somewhat elusive answer.

Please move this if I selected the wrong place to post. Most tilling equipment utilizes gearboxes with worm drive and a brass gear is the major part of that gearbox. I have a 1981 Troy-Bilt Horse, which recommends an 80-90 or 140 weight gear oil. I would like to use 85-140. I have been using...