Can gear oil be mixed?

Mineral oils, PAOs and esters may all be mixed together. Only polyglycol type synthetic oils (PG or PAG) may not be mixed with the other lubricant types. They can react together and form gum gels in the casings. Furthermore, they can sometimes be incompatible and immiscible with other polyglycols.Click to see full answer. Considering this, can you mix synthetic and regular gear oil?The simple answer: Yes. There is no danger mixing synthetic and conventional motor oil; however, conventional oil will detract from the superior performance of synthetic oil and reduce its benefits. So, yes, you can safely mix synthetic and conventional oil.Beside above, can you mix oil and grease? You should not mix oil and grease. Most greases are not reversible meaning the base oil will not be absorbed back into the thickener. Hereof, can you mix gear oil with hydraulic oil? Yes, and sooner rather than later. There are some nasty EP additives in the 80W90 gear oil that should not be in contact with certain hydraulic system seal parts longer than is absolutely necessary.What is 80w90 gear oil used for?The oil known as 80W-90 GL-5 is a lubricant for the gears in your vehicle. It is used in automatic and manual transmissions, and assists the gears in shifting smoothly.