So we've all seen the "there's crud in the bottom of my oil container" and the Pennzoil response about overbasing+sitting around leading to "deposits" in the bottom of the containers, well... here's some additional proof. I know we all will use oil indefinitely, but this supports the "shake & bake" method of oil changes.
From Machinery Lubrication:
Quote:
Engine oils have the shortest shelf life due to the heavy additive load they carry and thus should be used as quickly as possible to mitigate any problems associated with separation.
From Machinery Lubrication:
Quote:
Engine oils have the shortest shelf life due to the heavy additive load they carry and thus should be used as quickly as possible to mitigate any problems associated with separation.