I would wager that you would notice, for two reasons: UV and heat tinting the exposed paint, and caked dirt around the letters shading the paint. The latter of the two will have to be clayed and polished and may remedy that problem, but the first is iffy. What colour is it? Silver would probably be the least noticable difference and any metallic would help.
Waxing every three months for an un-garaged car is not often enough: your wax is pretty much gone in 4-8 weeks.
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