Answer: Although the types and viscosities of the two oils are exactly the same, their chemical compositions are not necessarily the same. When lubricating oils formulated with different additives are mixed together, it is necessary to avoid precipitation between the additives to avoid adverse consequences or even equipment lubrication accidents. Therefore, different types and brands, different manufacturers, and new and old oils should be mixed as much as possible.
The following situations can be mixed if there is no abnormal phenomenon or obvious performance change after the mixing test:
(1) Products of the same type and basically similar quality from the same manufacturer.
(2) Products of the same type but different brands from the same manufacturer.
(3) Different types of oils, if it is known that the two groups to be mixed do not contain additives.
(4) Different types of oils, if there is no abnormal phenomenon or obvious performance change after the mixing test.
