time to flush water system and transmission?
Not necessary but a good idea if you want to maintain your car and keep it running in tip top shape for years to come. So if you plan on keep your car for another couple years, it is good insurance to do so and I recommend it.
on my jeep it was required to change all fluids at 30,000 miles transfer case rear n front axle transmission... plus like tom said keep it maintained in good shape
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