“Can an EP-00 grease be used as a replacement for an ISO VG 220 gear oil? One of my customers is having problems with his enclosed gearbox. The manufacturer-recommended product for the gearbox is an ISO VG 220 oil. However, due to severe wear and tear as well as clearances in the gear teeth, the customer is mixing ISO VG 220 gear oil with an NLGI #2 grease. Using this mixture has solved the problem to some extent. My question is whether I should recommend the customer use an EP-00 grease with a base oil viscosity of 190-220 as a replacement for the ISO VG 220 gear oil.”