And 0W-40 as has been mentioned all over this thread.
http://www.epc.shell.com/Docs/GPCDOC_GTDS_Shell_Rotella_T6_0W-40_(CJ-4)_(en)_TDS.pdf
http://www.truckinginfo.com/channel...w-40-designed-to-operate-in-extreme-cold.aspx
Thanks for the heads up on this, I haven't seen a jug of 0W40 T6 before
