What did you do to your NBS GMT800 Tahoe/Yukon Today?

Discussion in 'General Discussion' started by vwbeaner, Mar 29, 2010.

  1. Sam Harris

    Sam Harris Full Access Member

    Posts:
    1,134
    Likes Received:
    1,261
    Joined:
    Sep 26, 2018
    Location:
    Denver
    Name:
    Sam
    Ahhhh yeeeaahh... I wish I could NAIL IT all day. That would be a sweet job.
     
    Rocket Man and Fless like this.
  2. Fless

    Fless Supporting Member

    Posts:
    1,060
    Likes Received:
    1,033
    Joined:
    Apr 2, 2017
    Location:
    Elev 5,280
    Name:
    Steve
    I heard it all the way across town!!!
     
    Rocket Man and Sam Harris like this.
  3. Tonyrodz

    Tonyrodz Resident resident

    Posts:
    15,405
    Likes Received:
    14,773
    Joined:
    Feb 16, 2012
    Location:
    Central Jersey
    Name:
    Tony
    Lol, sounds great!
     
    Sam Harris likes this.
  4. ScottyBoy

    ScottyBoy Full Access Member

    Posts:
    2,271
    Likes Received:
    1,014
    Joined:
    Jun 27, 2010
    Location:
    Shreveport, La
    Name:
    Scott
    Not sure why it says 14 miles on it for 2017. I believe it had about 140k on it or so. Maybe they forgot a few zeros on there, lol. But yes, my last sample was indeed much worse. I just chalked it up to going SO long on the oil, because I went over 10k miles on it. The next one I only went about 5k, but I forgot to do a sample. Now I'm at 148k and just changed it and sent in another sample. It makes sense that all the wear metals are down, but there's still what they call critical levels of coolant in the oil. The ONLY visual sign of coolant I have EVER seen in my oil was moisture on the bottom of my oil fill cap. And I was told that is normal with my driving style, I very rarely drive more than 4-5 miles at a time, then the truck sits for at least 6-8 hours.
     
  5. HiHoeSilver

    HiHoeSilver Away!

    Posts:
    9,168
    Likes Received:
    10,320
    Joined:
    Feb 28, 2017
    Location:
    Chicago
    Name:
    Nate

    Your wear numbers have certainly improved. Says a lot for a shorter OCI, imo.

    Your sodium and potassium are REALLY high. After ~6k miles, mine were 8 and 2, respectively. You have coolant in there somehow. Your intervals are very long, so it's tough to guess how bad it is. A little leak adds up over such a long OCI.
     
    Sam Harris likes this.
  6. Rocket Man

    Rocket Man Build It Better

    Posts:
    11,702
    Likes Received:
    15,992
    Joined:
    Dec 25, 2014
    Location:
    Oregon
    Name:
    Mark
    Whew, Im glad those wear metal numbers are down, that looked real bad last time and that note was scary. I’d do another test at maybe 1500 miles just to see what’s happening more short term.
     
    Sam Harris likes this.
  7. ScottyBoy

    ScottyBoy Full Access Member

    Posts:
    2,271
    Likes Received:
    1,014
    Joined:
    Jun 27, 2010
    Location:
    Shreveport, La
    Name:
    Scott
    I'm planning on doing another oil analysis at 3k miles this time.
    Yes, I know I am losing coolant but I don't see any external leaks. I probably have to add almost a quart about every 10 months or so. A mechanic told me that was within the "normal" range but obviously it's getting into my oil somehow. I'm thinking about getting one of those cheap borescope cameras that attach to your phone. And inspect each cylinder with that and go from there. I don't know what else to do.
     
    HiHoeSilver and Sam Harris like this.
  8. ScottyBoy

    ScottyBoy Full Access Member

    Posts:
    2,271
    Likes Received:
    1,014
    Joined:
    Jun 27, 2010
    Location:
    Shreveport, La
    Name:
    Scott
    Also, just before that oil change in 2017 with the very high wear metals, I did an engine flush. So I don't know if that loosened up any old crud and that's another reason why the numbers were so high. I flushed it, dropped the pan and replaced the oil pick up tube and screen. I had to replace a leaking oil pan gasket anyways, so I decided to flush it and get out any old sludge. And there was indeed some sludge in the oil pan. I COMPLETELY cleaned the oil pan before installing the new gasket though.
     
  9. HiHoeSilver

    HiHoeSilver Away!

    Posts:
    9,168
    Likes Received:
    10,320
    Joined:
    Feb 28, 2017
    Location:
    Chicago
    Name:
    Nate
    The flush would definitely raise those numbers.
     
    Sam Harris and ScottyBoy like this.
  10. Rocket Man

    Rocket Man Build It Better

    Posts:
    11,702
    Likes Received:
    15,992
    Joined:
    Dec 25, 2014
    Location:
    Oregon
    Name:
    Mark
    Yeah I wouldn’t have done an oil analysis right after a flush. Their tests are pretty sensitive. I just did an analysis on my 08 Silverado that has 60k miles on it. I had no previous record of oil changes so I had no idea how long it had been, plus I realized after they sent the results back that I had drained the oil into the same pan that had been used to drain my trans on the Beast after I had grenaded it. I’m pretty sure the oil mixed in with whatever stuff that was deposited in that pan from the trans because the report pretty much said the engine on the Silverado was about done lol. That’s when I remembered what I had done when I got the sample. Next time it comes right out of the drain and into the sample container.
     

Share This Page