Hi all, I have a 1986 Toyota Landcruiser with 130k that will be spending its first winter in Park City, UT. It had previously been living in Tucson and Albuquerque and happily running Rotella T 15w-40 year round. My normal drive is a 15-20min to the resort with most mornings in the teens down to around -15f and I don't expect to see any temps above 50 until its next change in late april. For those not familiar; its a 2f engine. Which is a carbed, flat tappet, low spring pressure inline 6 engine, loosely based on the old chevy stovebolt 6. It looks like I should go with a 5w-30, and I'm looking for some recommendations.