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Ended up doing something similar to what @YYC-SIERRA said. Drained the pouch into a cheap clear pitcher, the tiny piece of soggy paper floated out on the last drop, used a spoon to lift out of the oil, then used the pitcher into a funnel to put oil back in the pouch. We'll call that East TX Engineering. Thank you @YYC-SIERRA!

I definitely thought about that but I unfortunately don't have a pump do that. Then I got worried about other contaminants lol. Figure by the time I buy a pump @ $15-20, I would have been able to just buy that new pouch of Amsoil and be done with it.

Was cutting open the seal and a tiny torn piece of it, maybe the width of a popcorn kernel, fell into the oil. I tried to drain the pouch into another used pouch to catch it but couldn't. My question is: if I use this pouch to fill the rear diff (did the front diff, had 5 pouches on hand) and the paper finds its way in, will it cause any issues? Don't worry, I'm already erring on the side of caution and have a pouch set aside at my local Carquest (only folks in East TX who carry Amsoil 75w-90) to pick up tomorrow AM, but just curious if it's even worth worrying about. Side note: if you order Amsoil products right now through their website and are in DFWish, standard ground shipping equates to overnight. They have a distribution center in Arlington! Order Signature Series ATF for the t-case yesterday afternoon and it was here before lunch today!

Just thought I’d drop an update here! after reading through everyone’s advice, more threads, and endless back and forth, I got the transmission service done. I opted for the drop and fill as it seemed to be the consensus better choice here and silveradosierra. I was never having any transmission issues prior to, just trying to make sure I do what I can proactively to ensure longevity on this truck. As soon as I left the dealership, I could feel a difference. Truck shifts buttery smooth now. Not that it was rough or anything, it’s just a noticeable improvement. Plan to keep doing this routinely every 25k or so. Did not go to original dealer that quoted me as they wanted to flush with cleaning chemicals then fill. Seems like that would be a horrible idea. talked to a dealer closer to me and they said the method performed is what GM recommends, trusted them to do it. next up is Bilstein level and the borla GM exhaust!

I appreciate the detailed response! Are there any resources that you recommend that may detail your process of the fluid service? I'd be curious to look into further. The way I understand the flush method explained by the dealer, is they force inject an extreme amount of fluid through the transmission to clean it out, and once clean just top off and let 'er rip. With what you're saying, this can cause things to dislodge and potentially cause issues. With your method, it's not the force method, just a simple drain all the fluid you can, then top off to spec and it's good to go - leaving the filter as it essentially increases in efficiency with age, and leaving behind any residual fluid/buildup/whatever. I can see the benefits and negatives to both sides I suppose. With regard to the break fluid, from what I've read, though not first hand experienced, is it's best to fuss with the fluid when changing breaks and rotors. Can you shed some light on this? As with everything in life, opinions are like booty holes - everybody's gottem. And everyone thinks they're right. Thing about a booty hole is it's smack dab in the center of my long back, not leaning one way or the other, just doing the best it can with the brown stuff it's given.

Can you explain the thought process behind this method? Not questioning, just want to understand better. I'm rather new to the idea of this as I'm sure you can tell, so it's all beneficial to form my own opinion. Thank you for the help you've already provided!

Complete drain and fill, or the drop the pan and top off with 6-7 quarts method?

I've searched pretty much endlessly for some insight into this, and haven't found any good input outside of a lot of arguing. Thought I'd see what you fine folks may recommend here. Have a 2015 with the 6 speed transmission. Just hit 100k. I am the second owner (got at 23k) and to my knowledge has never had a transmission service, diffs, really anything outside of normal oil changes and filter changes. My question is this - what is the current recommend procedure for servicing here (both of transmission and anything else that might be recommended)? Do I do the exchange + filter, or do I do the full flush the dealership is recommending me? From what I've read, the diff fluid is an easy switch so I can do that. I don't rag this truck, don't tow, sometimes have stuff in the bed. Nearly 100% highway miles. Roughly 2300 hours on engine. Transmission stays at 190-192F. Don't have any mechanical issues here, and really nothing outside of a condenser and evap temp censor replacement last year. What else is recommended here? I'm a big dumb idiot and just haven't taken into account the additional 97000 service plan, as I've always heard never to mess with transmission fluid. I want to make sure I get as much as I can out of this truck. I appreciate any feedback/help/advice you may have. Also don't mind a little roasting as I'm sure it's warranted.