im in a decision to buying (2) 12 quart cases of Royal Purple oil from a friend that works for the company. i was wondering how long can i keep engine oil for? cause if i have a total of 24 quarts, and only use 3-4 quarts every 3 months, will the rest of the oil lose its viscosity, and weight?

any help gladly appreciated!

 

Seems like the logical thing to do would be to ask your buddy who works for Royal Purple. If he doesn't know, I'm sure he could ask someone that would....

 

it will be fine for as long as you want. its oil, not milk.

 

If it's sealed, I would say a good couple of years. Plus, it's synthetic. That doesn't have the same break down type properties of conventional oil