Palmer78
Well-Known Member
I went out to change the gear oil for the drive motor on my new to me mini excavator, and purple oil came out which looked good and clean. I am guessing it's royal purple, or could it be something else? Seeing this oil made me want to put royal purple back in. My excavator requires a 90W gear oil (GL-4, GL-5) but royal purple only has 75W90 which meets the GL-4, GL-5 spec. Would this be OK to put back in the drive motor? It seems very difficult to find straight 90W oil.