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  1. Seamus

    360 camera

    I believe it started in the 2018 Escalade. The Denali did not have it in that generation. Started in 2021 Yukon.
  2. Seamus

    2015 Yukon Denali

    I owned a 2015 and 2017 Yukon Denali XL. The 2015 was horrible Dealer made good on a 2017 at cost to keep me as a customer. I had the 8 speed in both. I loved the 8 speed and it was great for towing and drivability. I had the 6 speed in my 2013 and hated it. Bogged down and always downshifting...
  3. Seamus

    18 LT to 18 Denali

    18-20 gets you the 10 speed in the Denali. BIG upgrade. The 6.2 is not only faster it gets better fuel mileage. Big win, great decision. Yes the L86 can be tuned. There are also guys out there where you can send in your computer and the will delete AFM. Its cheap. Pedal commander will get you...
  4. Seamus

    1st time replacing 10 speed fluid & filter

    Thanks! Did you do the half torque or just a good snug?/ I already did the wifes 2018 escalade and it went really well. But now I am about to do my '21 Sierra. I have the fluid pump and all the filter and fluid...just concerned something is different regarding the bolts?
  5. Seamus

    1st time replacing 10 speed fluid & filter

    Did you use new filter bolts??? Read they are not reusable. One time use torque then specific degree turn. I bought the AC Delco filter--no bolts! So i called my dealer and they had none. He checked other dealers none around. I asked well when a customer comes in today for a trans filter and...
  6. Seamus

    6.2 gas vs. 3.0 Duramax, which one to buy?

    Diesel maintenance? 7 quarts of oil and a filter. Fuel filter about once a year...25 bucks on rock auto -10 minutes to change. Thats it. Bulletproof drivetrain, average 25 mpg all day.
  7. Seamus

    Strange start after battery died during oil change, video included

    I was told that if the hood is not completely closed the truck does not fully go to sleep, meaning its drawing more keeping all the modules awake. So if the battery was marginal this could be what caused it to run down. A mechanic friend told me that after seeing my truck with a battery tender...
  8. Seamus

    Dead again…

    The modern cars go nuts with a weak battery. Have experienced this myself twice. A loose battery to starter connection is another common issue. Then grounds being loose and arching. Bottom line a battery or loose connection on any battery wire or ground will wreak havoc. All an easy fix if they...
  9. Seamus

    How much trust do you have in the 3.0?

    2021 Sierra Denali CC w/ 25K on it. Second day of ownership had a light, and it needed a coolant hose routed differently as it did not flow correctly?? Took 1 hour. Not one issue, since then. Been bulletproof, lots of towing also. Taking it on road trip up north end of the month 2600 miles...
  10. Seamus

    Dead on side of road

    Bad battery. Bad alternator. Loose connection at starter. Loose terminals. Ground. These new vehicles go nuts on a bad battery or bad connection. Keep us updated.
  11. Seamus

    My first mechanical failure on the 3.0

    What year is your truck.
  12. Seamus

    6.2L or Duramax reliability

    I am about the same. I use very little DEF under normal driving. I bought 10- 2.5 jugs a year ago and never need DEF. It goes to half right around my 5K oil change. Towing I use plenty. 1-2 jugs in 1600 miles of towing to Va.. I am doing about 12K a year and adding DEF 1-3 times of a 2.5 gallon jug.
  13. Seamus

    2023 Yukon/Oil filter and oil.

    Mechanics choice and what I use is always AC delco and mostly Wix...which is Napa silver or gold. Mobil 1 bought at Walmart for best price. Cheap, easliy found and good insurance.
  14. Seamus

    Just took delivery!

    That is a classy looking rig! Best of luck!!
  15. Seamus

    Connected services prompt constantly popping up

    Wow! Thanks so much, thats great info, much appreciated. I actually have a pickup, so this is golden. We gave up on the Yukon XL Denali for now. Awaiting a future deal. The second video applies to the new pickups and he specifies the few drawbacks...that really are no big deal, as I use Apple...
  16. Seamus

    Connected services prompt constantly popping up

    The fuse worked on many prior generation trucks. Not this one. They have gotten quite advanced and several things are tied into that module apparently. I am friends with a GM tech who pulled the whole circuit up and he tells me it cant be done without issues. Yet, there is a video on you tube...
  17. Seamus

    Connected services prompt constantly popping up

    Dont want to have a "tin foil hat" conversations about onstar or cell phones or what anyone would find out, I do not subscribe to ideology of "if your not doing anything wrong" what can they find out? That is an ignorant and naive way to think. It is privacy and they monetize and do use your...
  18. Seamus

    Connected services prompt constantly popping up

    I called Onstar to inform them I want a total disconnect from their services. I did not want or give permission to track anything on my truck and did not want their emails which confirm everytime I change a setting which confirms the fact that they are tracking everything my truck...
  19. Seamus

    Fuel quality at different stations

    I have found with this truck the 2 main factors that significantly affect fuel mileage is regens and a head wind. Have literally had the same issue and mileage always comes back....if no regen, and the wind is in my favor. Realize as your driving the road is bending and the wind is...
  20. Seamus

    Sharp Edges Under Hood

    Great idea, good stuff. There are alot of very sharp places under the hood on some of the stamped holes.
  21. Seamus

    Pricing vs MSRP

    Years ago I almost bought a hard to find Corvette Zo7 in California, I am in Florida. They had one of 2 in the country with that spec at the time. The dealer told me i could purchase and ship to Fla with no issue. BUT if i wanted to fly in and do the deal and drive home, I had to pay california...
  22. Seamus

    Tomorrow’s the big day

    Looking good!! Best of luck! A real highway hauler! I too only drove 300 miles on stock tires and immediately put on Michelin Defenders. Best tire on this truck, and adds to a wonderful ride. Great choice!
  23. Seamus

    New to me 2021 Yukon XL Denali

    Thats quite an upgrade!! I had a 2015 and 2017 Yukon XL Denali....the 2021 is leaps and bounds above those. Great ride, looking good, enjoy!!
  24. Seamus

    2015 Tahoe/Can I reuse AFM Lifter Guides?

    It is widely known to buy new ones and only use the GM ones. They are cheap. They also wear out a little nd the lifter can spin and wipe a cam. Cheap insurance, buy new GM ones. Many guys bought eBay Chinese lifter trays which are out of spec and wiped brand new cams. I just refreshed a motor...
  25. Seamus

    Finally! My yukon "Black Beauty"

    Thats a beautiful truck! Commanding appearance! Best of luck!

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