Recent content by Jay P Wy

  1. J

    BREAKING: GM is officially recalling the L87

    2019 & 2020 info for the Silverado/Sierra L87s. https://gmauthority.com/blog/2025/04/gm-explains-why-6-2l-v8-l87-engine-recall-doesnt-apply-to-2019-2020-vehicles/
  2. J

    BREAKING: GM is officially recalling the L87

    Since the 19 & 20 Silverado & Sierra have the L87 6.2l engines and they are not included (at least not yet) there must more going on than just an oil problem. Must be a parts or assembly/manufacturing issue on top of the change in oil from 0W20 to 0W40.
  3. J

    Massive recall coming soon

    Here is some info. Looks like the 0W20 is gone at least for the 6.2l.
  4. J

    Suggestions for quiet aggressive looking tread tires

    I have Falken Wildpeak A/T4 Ws on my 2008 Avalanche (275/55R20). They are quiet, balanced with no issues, do well on wet roads and are great in the winter. Pic is from Tire Rack but I got them from a local dealer.
  5. J

    New to diesel - help needed

    Nothing new with the LZ0 diesel. It's been in the Silverado/Sierra since the 23 model year and put in the Tahoe/Suburban/Yukon for the first time in the 25 model year. The LZ0 3.0l diesel still uses the same oil pump drive belt as the LM2.
  6. J

    New to diesel - help needed

    3.0l diesel has a timing chain not a belt. It does have a wet belt for the oil pump which has a 200k or 15 year life span per the diesel supplement.
  7. J

    1996 Yukon radiator recommendation

    FYI you're in the wrong section. This is 2021 and newer. That said Rock Auto has them from $103 to $426 depending on the brand and likely the quality (guessing you have a 350 and not a 6.5l diesel).
  8. J

    Fluid Replacement - Good PM Practice or Waste of $$

    As other have said follow the severe schedule and I would also add the differentials when the transmission/transfer case is done. The only one I don't agree with is brake fluid. Brake fluid is hygroscopic (absorbs water) so if you live in a humid climate 5 years may be too long.
  9. J

    Fuel Filter

    The fuel filter is one of those cases where the OEM filter is the best. Be careful if you buy them from Amazon as they sell filters that look like GM/AC Delco filters but are actually cheap knock-offs. FYI the fuel filter is the same as the 6.6l L5P duramax uses so they are easy to find.
  10. J

    ZR0 problems

    What's a ZR0? The 3l diesel has 2 RPO codes, LM2 (1st gen) & LZ0 (current gen). As stated above the diesel hasn't had near the issues of the V8 gas engines with all their lifter issues due to the AFM/DFM. If the service guy can't even correctly identify the 3l diesel I sure wouldn't trust him...
  11. J

    NHTSA opens preliminary probe into more than 870,000 GM vehicles

    The two I had had didn't and the owners manual says it's recommended but if you run 87 oct you will loose performance. It's even worse if you live at higher elevation where regular is 85 octane.
  12. J

    Engine Bay Noise - Blown Engine

    I would look at the belt or belts to see if it's coming apart or something is touching/rubbing anywhere near the belt. If you don't see anything my first step in trouble shooting is to remove all the belts (don't know if yours has 1 or 2 belts) and see if the noise goes away. I can't imagine...
  13. J

    NHTSA opens preliminary probe into more than 870,000 GM vehicles

    DFM also puts a bigger demand on the oil pump (16 vs 8 shut off lifters). Maybe the low oil pressure to the mains at startup due to the added load on the oil pump has something to due with this. Odd thing is the 5.3l has the same DFM, so maybe it's the oil pump (variable vs non-variable). Fords...
  14. J

    NHTSA opens preliminary probe into more than 870,000 GM vehicles

    Ok since the L86 is not affected and had the same trans and HP/TQ what changed between the L86 & L87? Seems to me as an engineer that's where the focus should be in looking for the problem.
  15. J

    NHTSA opens preliminary probe into more than 870,000 GM vehicles

    The L87 was used in the 2019 and newer Silverado & Sierra with the 10lL80. Are the 19 & 20s from the pickups having the same issues or is it 21 and newer? Did the 19 & 20 SUVs have the L86 or L87?
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