Just got a 2102 Optima with the non turbo GDI 2.4 engine. According to the owner's manual you can use just about anything in it. It suggests 5W20, 5W30 or 10W30 GF-5 but says GF-4 is fine as well as SM but if you cannot find it then SL is fine too. Does not sound like the manufacturer is very picky about what goes in there as long as it is replaced according to it's suggestions of 3,750 miles severe schedule or 7,500 regular schedule. I asked the dealer what they used and they pointed to Car Quest 5W30 conventional sitting in cases in the corner of the parts dept. They told me even though the manual recommends 5W20 for best fuel economy that they suggest using a 5W30 and going no more than 5k OCI. I am planning to use 5W30 for the fuel dilution issues that the DI engines seem to be having. I figure if it shears to a 20wt it is still within spec. I figure I will change the FF at 1k (almost there) miles since it is most likely 5W20 and want to go with a high moly oil for at least the rest of the break-in period. Probably going to use PYB 5W30 and change it at 3k intervals till 10k to get all of the wear metals out of there. My question is what do I do past that? I figure there is no point in going to synth oils since they will not be in there very long. I have a fairly large stash of synth oil at this point but do not think it is worth using up oils in this car at short intervals that I can use in something else for 3X the miles. Do I just do a 3,750 OCI or go the 5K the dealer suggested? Most of the driving around here is prob 80-90% highway with the cruise set so the driving style is very easy. Would that keep fuel dilution down enough to run oil out to 7,500? Any suggestions would be appreciated especially if anyone has one of these engines and can share their experience.