motor oil storage & life

The Mobile one site says five years for their products opened or unopened stored in a dry cool place. In the 70s my Dad was bulk agent for Standard Oil and they wanted all oil over five years old returned. It was not stored in a dry cool place.
 
Hi, - After opening a bottle of motor oil, for how long is it good? I have some that has been open about 4 years. Just doesn't make sense to by yet another bottle every Spring. Thanks.

as long as you keep it clean, it never expires...oil is billions of years old anyway
 
I remember once someone wanted to know if they made a stabilizer to keep their big bottle of Stabil good....
 
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