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<blockquote data-quote="BDCEquinox" data-source="post: 21841" data-attributes="member: 8008">Yes, you absolutely need to change the transmission fluid. Oil does not exist that does not break down, burn, or get contaminated, especially the conventional transmission fluid GM uses for factory fills. A vehicle would need to be in absolutely perfect conditions to make a 'lifetime fill' before the car was decommissioned. More on this below.Perform a transmission fluid exchange every 45,000 miles (drain and fill) per the severe service schedule in the manual regardless of how you drive.My personal recommendation is that at the first interval (45,000 miles) do a drain and fill 3 times with full synthetic fluid (running the vehicle and shifting between gears each drain), then each subsequent service (90,000, 135,000, etc) do a single drain and fill with the same synthetic fluid.Regarding the perfect conditions above, both of my wife's previous 2 GM vehicles were bought (1 brand new and 1 with very low mileage). In both cases, the vehicles were lady driven, garage kept, 80% freeway miles, no dirt roads, and no towing. At the 45k service on both, the transmission fluid was absolutely pure black and badly burnt. You couldn't have driven it more softly than she did and the fluid still was in horrible shape.</blockquote>

[QUOTE="BDCEquinox, post: 21841, member: 8008"] Yes, you absolutely need to change the transmission fluid. Oil does not exist that does not break down, burn, or get contaminated, especially the conventional transmission fluid GM uses for factory fills. A vehicle would need to be in absolutely perfect conditions to make a 'lifetime fill' before the car was decommissioned. More on this below. Perform a transmission fluid exchange every 45,000 miles (drain and fill) per the severe service schedule in the manual regardless of how you drive. My personal recommendation is that at the first interval (45,000 miles) do a drain and fill 3 times with full synthetic fluid (running the vehicle and shifting between gears each drain), then each subsequent service (90,000, 135,000, etc) do a single drain and fill with the same synthetic fluid. Regarding the perfect conditions above, both of my wife's previous 2 GM vehicles were bought (1 brand new and 1 with very low mileage). In both cases, the vehicles were lady driven, garage kept, 80% freeway miles, no dirt roads, and no towing. At the 45k service on both, the transmission fluid was absolutely pure black and badly burnt. You couldn't have driven it more softly than she did and the fluid still was in horrible shape. [/QUOTE]

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