For those who do not garage their vehicles during those -10 to -25 degree periods, going with 5w or 0w is advisable, especially with newer engines with VVT.
Originally Posted by TiredTrucker
i have grown fond of using 10w30 in virtually all my applications. My wife's Cadillac CTS, my 2015 Silverado 3/4 ton, my OPE, and my commercial trucks (HDEO in them). The only thing I have that doesn't get a 10w30 is my Triumph Bonneville that gets a 10w40. Central Iowa winters and summers. We hit some -25F actual temps this winter. It is not uncommon for 100F+ in the summer. 10w30 across the board. Not advocating anyone else follow the pattern, but it works for me. My wife's Cadillac CTS is a 2006 and we are not getting rid of it anytime soon. My commercial truck just turned 952,000 miles and still only uses a quart of oil every 11,000 miles. My JD zero turn mower also runs on 10w30 as does my Yamaha generator. I am not convinced that I need a 0w30 or 5w30 for anything. If I were to every move back to the interior of Alaska, then I will take a second look at those.
Originally Posted by 1JZ_E46
Generally speaking, with a 10W you can get an oil with a lower volatility (thicker blend of base stocks). You just have to live in the right climate. Keep in mind I said generally speaking. Of course there's low volatility 0W and 5W oils.