When you mix the two, you dilute the sophisticated additive package and uniform molecular structure of the synthetic oil with the less refined, more volatile molecules of conventional oil. While the physical properties of the oils are compatible, the performance advantages are lost when they are combined.
Mixing Synthetic and Regular Oil: What to Know
Another scenario involves a repair situation where a small amount of conventional oil is used to clean up a spill during an oil change. When Mixing Might Occur There are practical scenarios where mixing becomes a reality, even if it is not ideal.
Conventional motor oil is refined from crude oil, a process that leaves behind various impurities and inconsistent molecular structures. Recycling used oil properly is just as important as choosing the right new oil.
Mixing Synthetic and Regular Oil: Safe Top-Off Practices
Understanding the chemistry behind lubricants helps clarify why this practice, while not immediately destructive, is generally not recommended for optimal engine protection. Manufacturers specify the exact API service category and viscosity grade required for your engine.
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