New Atwood store opened by me and they sell Harvest King oil, which I never heard of but some say it is a Warren oil. They have conventional for 6.99 a jug (5w/20 is semi-syn same price) and full syn for 10.99 a 5qt jug. I bought a few jugs of each just to use for "free oil changes" I do for friends that have older oil leakers/burners but the Full Syn has the DEXOS label so it can't be too bad a oil and 10.99 for 5qts is a bargain.