chzuck
Thread starter
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 140 GL-1 oil because in my area it is all but impossible to find a GL-4 gear oil. Everything I have seen is GL-5, which Troy-Bilt does not recommend. So, I hear both sides, some saying it does not matter, others saying definitely do not use a GL-5 oil. I would like to see some official, factual data one way or the other.