Join Date: Nov 2012
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If you're going to get it undercoated, I'd push for garage, too. Minimal risk of added corrosion thanks to the undercoating, plus all the benefits Vanib mentioned.
I had my previous vehicle undercoated and kept it in an unheated, but attached, garage for the 10 years I owned it, and I never saw a spec of rust on the body. When I traded it for the RAV, it looked pretty much like it came out of the factory the day before, inside and out. (Mechanically, OTOH...)
I had a "rustproofing" done to it when it was new (as I had done to my current Rav4), so it was not an annual oil coating. I don't know how the differences in undercoating materials would apply in this situation, though, nor do I know the differences in amounts and kinds of chemicals used on the road where you are vs. where I am.
The only difference for you inside vs. outside is the activity level of the chemicals. If it's an unheated garage, that difference goes down and so one would hope the undercoating would more than make up for that difference.
Silver 2012 RAV4 Limited V6 4WD with Tow Prep and OEM Hitch.
Long live the RAV4 V6!