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You really should consider having the system flushed rather than drain and refill. The dexcool is rated for 5 years/100,000 miles, you are at the 5 year limit. The experience I've seen with extended life coolants is they tend to thicken [change viscosity] when left in too long, four years is a good change point. You might consider the flush before refill.
A word of caution I couldn't help but slop some coolant on my belts when I hooked up the unit, it won't come off and they chirp like hell. I figured the car is a 98 and although it only had 24,000 miles the belts could stand to be replaced. I keep the old ones in the trunk, never know.