I have used these in fleet vans for cleaning for almost 40 years.
I simply cannot recall one failing, ever. Even when run without any oil at all!
There are many synthetic lubes available for these. Do yours have full oil baths on both ends or is one end greased with fittings?
"In a democracy, dissent is an act of faith."
J. William Fulbright
Best ET-12.79 @ 111 mph
4340 pounds, Street tires
Just like we go to Publix