Google gets it done. :p
The desired oil temperature range for Lycoming engines is from 165˚ to 220˚ F. If the aircraft has a winterization kit, it should be installed when operating in outside air temperatures (OAT) that are below the 40˚ to 45˚ F range.
https://www.shortwingpipers.org/foru...AAAElFTkSuQmCCLycoming › content › operating-col...
Operating in Cold Weather | lycoming.com