A 5-qt. jug of Castrol Magnatec, Dexos1-rated 5W-30, and a quart of SuperTech Dexos1-rated 5W-30 High Mileage -- my Buick 3.6L requires 6 qts. Also a Mobil 1 filter. I'd have tried the Havoline 6-qt. box and an OEM ACDelco filter, but my local WM doesn't carry either.