200's Undersealed YES or NO?

Had my 200 for couple off months now, before winter kicks in needa get this done if not already done, so can anyone tell me for DEF if they come undersealed already and if so how long will it last for?
 
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undersealed - yes

anti-corrosion - 12yrs
paint - 3yrs

for added protection use a waxoyle kit on the underneath