kjh8sfk23r8
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Kia’s 3.8 does not require synthetic, although it would be a shame not to protect your investment by using the best oil possible. As a few have already mentioned above I would highly recommend using a premium 5w30 synthetic oil I will personally be using Mobil 1 Extended protection as well as using the stock KIA 26230 3CKB0 oil filter. I will also be changing the oil and filter every 5,000 miles.
From what I remember the owner's manual does not have any break-in style oil changes, the first is at 7500 and at 7500mi intervals as well from then on. Doesn't really make any sense to change early. Synthetics too have been proven to easily still be working well 15k+ on most engines. Save your money and time and don't change so early.