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Mornin there VO, I cant blame you one darn bit, I like thigns to be right and same as you, wonder about things like youre asking about. Basically, if the tractor is not gettign rid of coolant, theres no coolant geting into the oil, no oil getting into the coolant, the smoke out the stack isnt white or steamy looking after shes good and warm, and shes not overheating, I dont think a "bit" of vapor you mentioned is too much to worry about, unless and until other symptoms appear. Condensation in this type of changing weather can collect and take a while to dry out you know. Especially, in cold damp atmospheric conditions when shes not warmed up and the moisture all dried out. As far as the plugs heat range question, the heat range, determined by its reach, location in combustion chamber, mass and insulating quality etc. as to how well heat is retained or dissipated away, that will affect the operatign temp of the plug, but shouldnt effect any water vapor out the vent tube in changing from an 88 to an 86. Keep us posted though, and Good Luck. Ol John T
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