I changed my transmission fluid as recommended. I have 2015 GMC sierra 1500. I needed to put a new transmission in at 284,000 mi, I now have 328,000 mi. Tough to say; while its not an old truck, 284,000mi would be the equivalent of about 18yrs old figuring an average of 15,000mi a year. It was $4,000 to do it, I would definitely do it again, I have the lifetime warranty on the motor and those trucks are soo expensive, that it was worth it
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