Shel_B
Site Donor 2023
- Joined
- Aug 7, 2020
- Messages
- 5,167
I've read here, in various guises, that older oil, oil that's been used in the engine for some time (specific time has never been made clear) affords better protection than fresh oil. I wonder if there's any truth to that?
I recall it being said in one thread that it's a good idea to leave a small amount of the used oil in the engine when doing a change, as it would "season" the new, fresh oil, and better protect the engine. Given that there's often oil left in the engine when doing a change, there's often old oil mixed with the new. For example, 1.8 quarts remains in my engine when doing a complete change.
So, what's the story about using aged oil for greater protection?
I recall it being said in one thread that it's a good idea to leave a small amount of the used oil in the engine when doing a change, as it would "season" the new, fresh oil, and better protect the engine. Given that there's often oil left in the engine when doing a change, there's often old oil mixed with the new. For example, 1.8 quarts remains in my engine when doing a complete change.
So, what's the story about using aged oil for greater protection?