Why do we need to changes our oil base on range and time? Does the oil rot and if not why is there a date to change it?
Bonus question: is synthetic oil have an espiration date?
In: 5
I think it’s the additive package that deteriorates more than the base oil. There’s things in the oil that keep it stable and keep it balanced as it’s supposed to be. Moisture, acids, dissimilar metals, etc make it harder for the oil to protect as it needs to as it gets older. As far as the synthetic base oils, I have seen some conventional oils out perform synthetic because of the stable and robust additive package. The only way to tell if your oil is still good is to have a sample sent to a lab for oil analysis.
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