How bout if you just let it sit outside in the winter when they salt the roads but not drive it? My thinking is the salt won't be slingin' up into the fenderwells and undercarriage thus not as much rust promotion.

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'02 BMW 325i
'85 300D 450k
'93 190E 2.6 170k(killed by tree)
'08 Ducati Hypermotard 1100S 6k
'06 Ducati S2R800 14k(sold)