How old is too old for stored gear oil?

[Slick3914]

I have 2 quarts of Amsoil Severe Gear 75W-90 that are about 10 years old...any issues with using this oil or should I just buy some new lube?

 

[Thermo1223]

I have 2 quarts of Amsoil Severe Gear 75W-90 that are about 10 years old...any issues with using this oil or should I just here.

In sealed bottles or the like I wouldn't even think twice about it.

 

[vwmaniaman]

I was thinking that this tag line was about the age of people.

 

[SC Maintenance]

I am guessing that 90% of the rigs on the road that use gear oil, never get new gear oil. So 10 years in the bottle should be nothing. Yes, I would use it.

 

[Kira]

As SCM said above.....and I thought it was going to be about used cars

 

[Barkleymut]

I would shake it up really good and then use it.

 

[Kira]

Hey Barkleymut, did I ever tell you the dog next door is named Barkley? (true)

 

[Lubener]

I have 2 quarts of Amsoil Severe Gear 75W-90 that are about 10 years old...any issues with using this oil or should I just buy some new lube?

I wouldn't hesitate at all using that gear oil whether it was opened or not, as long as it was capped. Shake it before using. I have used much older without issues.

 

[JavierH19]

Oil in bottles don't go bad after a decade like people think unless it's some really awful group 1 formulation. But that amsoil is probably good for 40 years to be honest. Just shake it up once you drain about 2/3rds out.

 

[Whimsey]

This reminds me, I have a 40 year old unopened bottle of Valvoline 80W-90 gear oil. I have no use or desire to use it. I'll offer it free to my mechanic. His garage works on a large variety of cars and heavy duty diesel vehicles.