Unless you develop an overheating problem of some sort, it's my opinion that changing the mix often does more harm than good. Water is half the mix, and the water in your system now has been thru enough heat/cool cycles that all the air dissolved in it has been driven out. Air in fresh water can cause oxidation of metal. Also, depending on the water where you live, you introduce mineral that can cause scale when you add water. IF you want to be fanatic, consider distilled water for the mix.
Change the oil and transmission fluid, and leave the radiator alone.
My $.02.
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\'05 Limited Turbo Lite, (Silver, of course)4-wheel ABS, Sunroof, Spoiler, E&G Classic grill, K&N FIPK, BTG duals, rear lowered 1.5\", LED washer lights, $20 catch can, Aoogah horn, Weatherflectors, Sunroof Deflector, Fuzzy Dice, rear logo flames, rear pinstripe graphic, Gen3 Taillights, rear sway bar, hood struts, Strut bar.
Traded in \'02 Silver Touring Edition w/87,000 miles
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