Hey guys, I just bought a 2005 Kia Optima. It's got 38k mi. 4 cyl, 2.4L engine. I have no idea what the previous owner used as far as oil. The manual says that 5w-20, 5w-30 and 10w-30 are all ok to use. Which should I choose? I've never used 5w-20 before. Is it ok or what? I live in California. The winters get down to 32 and summers up to 104F. Let me know what you think.
Thanks guys.
Thanks guys.