Not a whole lot you can do about the rust unless you repair it and paint it. I supposed shooting paint or primer on it might slow it down a bit w/o fixing it. For my maxima I just wax it in the fall and throw two concrete beams in the trunk for additional weight for traction. But that about as much as i do for my daily driver.
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99 SI | 02 Maxima 6-speeds | 02 CBR F4i | 09 CBR 1000RR Repsol | 09 370Z Nismo