- Nov 4, 2014
- Wichita Falls, TX
I guess 16F might seem like a crisis if you live in the Houston area, but 10W-x synthetic oil will flow just fine down to sub-zero temps. Back in the 1980s when I was a young man in Minnesota, I remember starting my car one morning when it was -42F (actual temp, not wind chill factor). In those days I was running non-synthetic 20W-50 oil. In hindsight, I should have used something like 10W-40 during the winter months, but that engine held up well for years after that very cold winter.