I do not have the owner's manual for my Optima and do not know what is the best oil weight for my car?
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2004 Kia Optima Question: Motor Oil
Answer #1patrick mannion from Greg Solow's Engine Room, April 05, 2009, 17:16Master
Kia call for SG or SH spec oil. They call for 10/30W for ambient temps between 0 to 90 degrees and 10/40 for temps between 0 and 120 degrees. If your car has high mileage I would use 10/40. With oil filter change you need 5 quarts total.
Answer #2Visitor, April 23, 2010, 04:02
i do have the manual mail me email@example.com
Answer #3Visitor, April 28, 2010, 14:15
take it to your local dealer they have everything you need to know.....5w20....???????