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Sante Fe Sport 2014. Mixing Synthetic Oil change?

Anyone know if it is a good idea to use synthetic oil for my engine in a mix? I have left over 5W20 synthetic oil from another car. Just to save money, should I mix it with the normal 5W20 on my next oil change? The recommendation on the car is 5W20 non-synthetic.
 

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It won’t hurt a thing......been mixing left over oil for years on both motorcycle and car/suv/truck oil changes.
Thanks for the reply. Even though I didn't mix the oil. I used high mileage synthetic oil which is different from my original oil(which was not synthetic). The engine runs so much smoother than the normal oil. It also uses less MPG(miles per gallon) to get up to speed too. I was reading the MPG meter.
 
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