Originally Posted by FBinNY

BTW- if you're not sure, put the wheel outside tonight. In the morning try to spin the freewheel backward, Use a chain whip if you have or a Channellock plier for leverage. If it's frozen solid that's water. If it simply becomes super sticky or sluggish it's oil or grease thickening. Only water freezes solid, grease and oil get stiff but not solid.