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Can you mix synthetic oil with regular oil?

My car is overdue for an oil change. The price of oil keeps going up, and I want to save some money. Can you mix synthetic oil with regular oil?

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Melissa Harvey · Updated on
Reviewed by Shannon Martin, Licensed Insurance Agent.
Prices of gas—and oil keep climbing! I can totally understand why it would be tempting to mix synthetic and conventional oils to save money.
Synthetic oil and conventional are compatible, and you can mix them—but that doesn’t mean they should!
You should not mix synthetic with traditional oil because all you’re doing is diluting synthetic oil.
The little bit of synthetic oil you added won’t work as well, and you’ll miss out on all of its protective properties. Don’t waste your money on buying synthetic if you’re just going to add lower-quality oil to it.
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