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.
What did you do to your NBS GMT800 Tahoe/Yukon Today?
- Thread starter vwbeaner
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ScottyBoy
Full Access Member
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.
ScottyBoy
Full Access Member
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.
HiHoeSilver
Away!
The flush would definitely raise those numbers.
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.
HiHoeSilver
Away!
You want to make sure it's warm, and you get the sample from the "middle" of the drain. I usually open the plug, then about 3 seconds in, fill the sample jar (straight from the drain), pour it mostly out, count to about 5, and then fill it again. Call me crazy. Lol.
Here's my latest sheet. The time before last was when it was -30 here and I waited until almost 6k to change it. Didn't add any, but should have because I found it low. Too low. I have to think that's why the numbers were so bad. Did everything the same for collection. Had me worried for a minute. Newest sample in the mail now.
Yeah I knew how to take a sample, just forgot to do it while it was draining so I poured it out of the drain pan. Not smart lol.
HiHoeSilver
Away!
Lol. If I did that, his note would say "We found high levels of maple leaves and spider webs in your sample...."
Or more likely the chemicals that make up maple leaves and spider webs. I’m pretty sure my sample confused them with clutch material and trans fluid and who knows what else was in there from a grenading 4l60.
Tonyrodz
Resident Resident
Head bolts came in.
