I switched to M1 HM 5W-30 in my 10 yo (125,000 mi) 5.3 Chevy and first use it cut the oil consumption in half. It needed an oil change a couple months ago and with a cold winter shaping up, I decided to use up some old stock M1 0W-30. I follow the OLM which takes OCs out to 8,000 miles. I’ve burned two quarts of AFE in 5000. So, I will go back to year round HM after this. Starts good at -12F though.