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I don’t know. 50k miles? 75k miles? 100k miles? I have 50k miles and am about to do the transmission, but think I will wait on the coolant until maybe 60k or more. Age may be a factor also — my car is about 6 years old and I’d be inclined to change it by 8 years. I don’t have all the answers. I just don’t agree with never changing a fluid.
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