What would you guy's suggest for a beginning OCI for a 2007 Kia Optima using Amsoil XL 5W-20. The car has 15k miles on it. I plan on doing a UOA on it after the first use. I have been using PP 5w-30, but I got my hands on a case of XL 5w-20 and if the UOA proves good, I will continue with it.
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