Posted June 16, 2012 - 09:04 PM
This is one of those areas were you will find the old diehards that will use NOTHING but 90W GL1. These tillers have a bronze gear in the back for the tiller drive, at the time these were built GL1 was very common, but it has since been discontinued, GL1 has very few additives in it. You really need to run an oil with a High Pressure additive to help protect the 2 worm gears in it. They don't recommend GL5 gear oil in these because it can be hard on yellow metals. After a lot of research, I have found that GL5 will only harm yellow metals when the temp gets over 300*. This tiller will never see that high a temp, also this tiller will probably not see more a hours use all year. I was a member of the Troy-Bilt Tiller group, and got in an on-line fight over the use of any other oil other than GL1 oil. I posted all the information on this and was bad mouthed and all the info I posted was ignored. The manual for this was written over 25 years ago, before any of the new oils were created. I run 85W-140 GL4/GL5 in mine. I'm not going to special order GL1 for mine.
olcowhand, JDBrian, Toolpartzman and 1 other said thanks