Has anybody used this line of engine oils? Tonight, I was looking at the Synthetic Blends SM/GF-4, Starburst and Donut, API marks. A 5 qt jug of 5/30 is $12.69. A 5 qt jug of 10/30 is $12.49. The product data sheet is here: http://www.crossoil.com/lib/docs/pds/PDSSyntheticBlendPCMOSMSynGard.pdf The manufacturer suggests it is a 5000-7500 mile oil, which looks reasonable. I think these SM oils are being moved out to make way for the SN Dexos 1 variant. With the obscene price of engine oil lately, I thought I might bulk up my stash with 10 gallons or so of this. Only our G8 and Torrent see more than 3000 miles in a year. I was a little surprised to see these are blended and packaged somewhat locally; after Citgo absorbed Cato Oil and Grease (Mystik), I thought regional oils were extinct around here.