A poster else where has a theory that after Hyundai changed dipsticks in GDI engines to allow for approx. 1/2 qrt. more oil that those who experience oil drop to see if it settles down in between the FULL and ADD marks ? Seems like a logical thing to try as perhaps my GDI engine tends to use more oil when kept at the FULL mark for some reason ?Originally Posted by odieThe previous oil fill had level drop a bit below FULL when driving more at interstate speeds ( 65 ) . The oil was Platinum 5w-20 ( Dexos 1 , Gen 2 ) and remains the same . At 2900 + miles and no drop as of yet . Will consider shorter O.C..