This appears to be a mixed fleet (diesel/gas) oil. Have some vehicles rated 5w20, some 5w30 , none under warranty, ranging from 1996-2010 . Because this is an extreme cold weather rated oil, the viscosity is almost low enough to fall into a 20w range, so if I could get a sufficient supply, would it be a bad idea to use this as an "across the board" oil for all my vehicles ? My truck is on 10k OCI as my shortest drive is usually 1hr+ with a 50k a year average. The wife's gets 5k OCI, and the son's truck gets twice a year as his miles per year is very low. Any thoughts ? Thanks for your input.