I'm facing a problem only a BITOG'er would face. The 300C takes 7 quarts of oil. I purchased an extended 24 month warranty where I have to change my oil every 5k miles. The owners manual says 6k is max under factory warranty anyways. I know using synthetic that short of a drain is a waste. BUT, my brother works at Napa. I can get 7 quarts of 0/5w20 Napa synthetic for $25 plus filter. On the other hand I can get 7 quarts Napa conventional for $18. At Wally I can get QS green bottle and MS5k just a few dollars more. QSGB has IMPRESSIVE specs for "dino" oil. As does PYB. Normally I'd throw in M1 AFE 0w20 and run it 10k but you know, it would void the warranty. Can anyone help my friggin' oil problem???