Can Fully Synthetic Oil and Semi-Synthetic Oil Be Mixed?

1 Answers
VanParker
07/29/25 9:05pm
Fully synthetic oil and semi-synthetic oil should be avoided from mixing, as it makes it difficult to accurately assess the oil quality. Below are the scenarios where oils can be mixed: 1. When the quality of similar products is relatively close, or when high-quality oil is mixed with low-quality oil and still used as low-quality oil. 2. When adjusting the viscosity or other physicochemical properties of the oil, different grades of the same type of oil can be mixed. 3. For different types of oils, if it is known that neither of the two oils contains additives, or one does not contain additives, or both contain additives but do not react with each other, they can generally be mixed. However, the quality of the higher-grade oil will be somewhat reduced after mixing. 4. Generally, mineral oils can be mixed with each other, and mixing between mineral oil and semi-synthetic oil is more common. However, mixing fully synthetic oil with mineral oil should be done with caution.
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