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About Grover67

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    2020 GMC AT4 3.0l

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  1. Yes correct I just worded it goofy when I stated "from factory fill". I ran the factory stuff and changed it @ 4400 miles and went to the Mobile1 for the next 2 changes until this last one when I switch to Amsoil @ 16000 miles. Put on 4000 since then. Don't really expect to see much different results between the two unless I send it in for testing, which I didn't do previous to compare. Not too worried with either other than its such a light oil, even my buddy isn't real comfortable with it. -Grover67
  2. Put Amsoil in this last oil change, so far really haven't notice a difference on mpg or loss of oil from what I've had in it before which was Mobile1 from factory fill. Not too worried other than a good option. Used several other Amsoil products in several vehicles and toys I've had so know how it works. Buddy of mine works at GM at the proven grounds doing testing and its all he uses and sells, so I'm good with it. -grover67
  3. Before I switch over to Amsoil this last change I was getting the Mobile oil through O'Reilly's. They had to order it in but said they were going to keep it in stock. I have a buddy that get the Amsoil through so I'll go that route from here on out, plus gives me a excuse for a visit anyway.... -Grover67
  4. Have 5100's on the back of mine and they were a nice improvement over OEM, was a little torn with what to do with the front. Go with the 5100's on the front or the spring 6112's? Went with the 6112's just due to the front takes a little more of the abuse and I didn't want to second guess myself not doing it lol! Nice improvement I think either way but the 6112's are beefy and so far have done a nice job. -Grover67
  5. Went with the auto version. Don't remember just that it would work for what I needed and it has. -Grover67
  6. I knew after hearing about this issue either I was going to do it or someone else, it was just of a matter of when lol..... Should of been something GM had a solution for before it left the factory but didn't. Went with one of the aftermarket solutions before I was swearing, works well https://tailgatefix.com/ -Grover67
  7. Mine has been great since I picked it up and haven't had to add a drop between oil changes always on the full mark. It's done some good long runs and to Florida, just got back last week from the Black Hills and a extra 3300 miles and its still at the full mark. Its towed several trailers and really haven't been easy on it from day one, I don't follow the book break in either. It had the original factory oil and changed to Mobile 1 on first oil change. Getting ready to do another change and going with Amsoil this time around. Right close to 16,000 miles on it now. Used the recommended 0W-20 oi
  8. Might talk to them to see or check some of the other places but they have been on backorder from what I understand. I just happen to hit Summit Racing at the right time when they a few sets left. Those parts were for the AT4/Trailboss version and won't work unless you are lifting yours. -Grover67
  9. Contacted them and that is what they told me to use with my 3.0l. Located a set from Summit Racing. No issues with them and like I mentioned about the same height as the factory setup on #1, wasn't looking to level it. I was going to use the 5100's in the front with the stock springs but figured why not go for complete setup with a more robust shock as I had to pull everything apart to do it anyway, so far no regrets Go for it if you want them back in your life!! -Grover67
  10. Went the same route with mine as you are. I went with the 5100's last summer after driving it some after purchase and felt the back end didn't feel real planted at times and really didn't care for that. Really noticed the difference after change out to the 5100's so they were well worth it. Was on the fence on what I wanted to do with front if anything but the more miles I put on I could feel the front not responding as well and decided to go with the 6112 setup at 10000 miles on the stock stuff. Picked them up through Summit Racing(p#47-309524) late this spring and installed myself, #1 setti
  11. Ya the paint really seems soft on them and the interior plastic is still easily scuffed, not real impressed -Grover67
  12. Ya diesel oil gets black fairly quick normal. Do good maintenance and use quality products and thats all you can do, run it. -Grover67
  13. Auto stop didn't work with the A/C in other settings than Max? -Grover67
  14. I went with Tyger for mine. No cutting factory mats, jack and handle bag go right back into factory spots inside, has gun rack and another holder if wanted. Not flimsy either, nice setup. -Grover67
  15. The "3.0L Duramax Diesel Engine Supplement" should of been included with the other booklets, yes it does include when suggested servicing and such but it is "not" a Service manual. This is what should of been included like others have suggested
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