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Was it ok that you put 10w 30 oil in my Kia optima with 5w20 already in it?
Wiki User
∙ 12y ago
All Kia products are designed to be operated with 5w-20. In an emergency you can add a different oil weight to get you by, but use as little as possible for as short a time as possible. Change the oil and filter as soon as you can and replace oil with 5w. The heavier oil will not hurt your car, HOWEVER, the tolerances on these engines are so exact that running a heavier oil in your car will actually expand the area between the lubricated parts.
What does this mean to you?
Extended use of the heavier oil will cause oil loss and smoking as the lighter 5w oil leaks into the cylinder and is burned at combustion.
Wiki User
∙ 12y ago
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