I remember from A&P classes at Embry-Riddle back in the '80's, that old piston aircraft engines used to dilute the engine oil with fuel upon shutting down in extremely cold environments.
M1 0W40 in a 220K v-6 2003 4Runner w/Frantz bypass filter
QSUD 0W-20 2010 RAV4 2.5L w/ Baldwin bypass filter
QSUD 5W-30 2016 NV2500 V-6 20K
dealer synthetic oil 2017 RAV4 11K (when I can get the dealer to follow instructions and change the oil at less than 10K mile increments).
QSUD 5W-30 2007...
My friends Father who lived 3 houses down the hill, changed water heaters for a living. He bought a new Chrysler New Yorker every year, and let his Wife drive it for the first year. Then he would use it for water heater replacement duty for the second year, trading it in after that, WITH NEVER...