The reason for cold weather starting/warm up, is the "cold thick" oil can blow the filter and/or seals resulting in oil weaks. Warm your cold tractor at idle at least 10 min. The colder the temp. lncrease the idle time.
Winter cold around 10 deg. and below be very careful. Your Idling/warm up time could make the difference! Happy seat time
or expensive wrench time ;( you choose.