Recent content by SuperOldSchool

  1. SuperOldSchool

    Spark plugs

    I would wait until closer to 90k. If the engine is healthy (not burning oil). They should last the full 95k interval - see my posts with pics on my plugs (I show both sets from 2 changes): https://www.tahoeyukonforum.com/threads/replaced-plugs-and-wires-at-76k-2015-denali.112374/
  2. SuperOldSchool

    Replaced plugs and wires at 76k - 2015 Denali

    OP with next set of wires and plugs - 172k on truck and 96k on the old wires and plugs. Took me from 12:30-2:15 start to finish. I did remove the passenger wheel liner again, it’s the best way. Plugs were not terrible, but it was time. All gapped at .040 except cyl 1 which was tighter at a...
  3. SuperOldSchool

    2015 Yukon SLT - Sunroof No Power

    I had same thing as Daddydave. I also had to replace the sunroof switch on the overhead. The switch along with disconnecting the console charge pad fixed it.
  4. SuperOldSchool

    XL / Suburban Rear Quarter Panel Rust

    2015 of mine is rusting on both rear fenders/wells too. BS they do this , even with 2-3x per week washes/ undercarriage cleaning at SuperKiss wash. Went to 3 shops and all 3 said they would not cut it out and reweld - only new panels. $3k each side. Have to drop ceiling to get to roof...
  5. SuperOldSchool

    2015 Yukon - Change both diffs' oil and transfer case fluid early on

    OP again, just did front differential again. About 64k on the oil. Plug was pretty clean and oil was not filthy at all, could have probably left it ( as stated in my last change), but my OCD won’t let me….. Out with Amsoil SevereGear 75w90, in with Valvoline synthetic 75w90.
  6. SuperOldSchool

    2015 Yukon - Change both diffs' oil and transfer case fluid early on

    You don’t want to add additional LS additive, but you can use that Mobil gear oil just fine.
  7. SuperOldSchool

    2015 Yukon - Change both diffs' oil and transfer case fluid early on

    Last Sunday also did transfer case fluid - 63k on fluid, 158k on truck. Fluid was nice and red. Magnetic plug not bad.
  8. SuperOldSchool

    2015 Yukon - Change both diffs' oil and transfer case fluid early on

    OP again. Changed rear diff oil today. 63k on Amsoil Severe Gear oil - 75w90, 158k on truck. Magnetic plug had a little paste- same as last 2 times. Inside of cover was a little dirty / oxidized. Sprayed out the gears with brake cleaner, wiped off magnet in pumpkin. I thought last time was...
  9. SuperOldSchool

    Fluid Replacement - Good PM Practice or Waste of $$

    I do brake flushes every 1-2 years. Trans fluid should be every 30k with the 6,8,10 speeds (my opinion). See my changes fluid below: https://www.tahoeyukonforum.com/threads/changed-my-filter-and-fluid-on-8l90-8-speed-today.126362/
  10. SuperOldSchool

    Changed my filter and fluid on 8l90 8 speed today

    OP again, another refresh at 155k miles - about 25k on fluid. Just did two extract and refills - 6 quarts each time, then level check. No pan drop with filter change. I took a quick few minute ride between drain/fill #1 to fully circulate the fluid. First extract was definitely darker than...
  11. SuperOldSchool

    What is the quarts "range" on the dipstick on these trucks?

    No I do it when I’m short … 153k mi on my l86 and no issue. Also I run 5w30 in summers
  12. SuperOldSchool

    What is the quarts "range" on the dipstick on these trucks?

    I do exact same thing - 9qts
  13. SuperOldSchool

    2017 Tahoe Low Milage Maintenance Recommendations

    You’re on the severe schedule - short trips. Change: Both diffs oil Transfer case Trans fluid Brake system flush I’d do coolant too - that’s just me/ my thought Grease zerks on front suspension- only 2 Run a dose of Techron thru tank before oil change
  14. SuperOldSchool

    Changed my filter and fluid on 8l90 8 speed today

    It runs about 50-60 degrees cooler than it used to.
  15. SuperOldSchool

    '21 Tahoe Z71 Transmission Failure

    Is it now fixed!?
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