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Sierra 3.0

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About Sierra 3.0

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  1. Is the ATV pushing against the tailgate? If so you may have to get 2 persons and each person push in on the outside of the tailgate near the latches and then try pushing the button to see if it will release.
  2. No, I did not measure the drop but I could see it. The steering felt fine and not loose. When I picked it up I just used the same setting he had for his F-150. I did tow a camper with my 07 Duramax. We took a trip to Texas and went across the entire state and along the Gulf Coast. I seem to remember getting about 10 or 11 MPG for that trip but it was a lighter trailer than the one I towed last week and the computer usually overestimated my mileage instead of underestimating it. I hope you guys have a great vacation and I know you will enjoy the pulling experience!!
  3. My engine makes a more pronounced diesel noise occasionally. I especially noticed it after removing a heavy trailer and the first few miles unloaded it makes more noise. I would not call it knocking though.
  4. I filled up before I left. I used about 15 gallons during the trip. Just FYI...I hate DEF. Its not too bad if you fill up at a pump but if you use the jugs it overflows and leaves nasty white crystal mess all over your truck side. It also makes your hands all sticky.
  5. That's been very consistent with regular driving as well. The hand calculation is always better than the computer.
  6. I just got back from vacation and thought I would let anyone who wants to know what it was like to tow with my 2020 GMC SLT 3.0L diesel. I will include my towing fuel mileage for the trip. I purchased my truck on April 15th of this year. I had an initial build quality issue with it as it was leaking oil when I brought it home. Turns out there was an improperly installed gasket and seal leading from the oil pump to the engine causing the leak. The engine leaked 2 out of the 7 quarts of oil before the problem was found. The dealership fixed the issue and I have been trouble free since. The truck has 6700 miles as of today. Overall I'm very happy with the power/smoothness of the 3.0 and 10 speed transmission. In everyday driving it's a really nice combo. I know this engine is an unknown in many ways but I wanted better fuel economy and after an abundance of research I took the gamble on the GMC. I really like the look of the truck and I have wanted a 1/2 ton GMC for some time. I'm coming from a 2007 new style Chevy 2500 6.6 Duramax. My average MPG for the 166,****** miles I drove it was right at 14. I kept it stock and used it for occasional towing but mostly commuting. I had very little issues with the truck other than rust that developed over the rear wheel wells. Last week my family and I took a trip from Missouri to Lake Superior and Lake Michigan on the US side. We left on June 20th and got back on the 28th. We used RV Share to rent a travel trailer in Iowa on our trip to the lakes. The trailer was a 32' Keystone Bullet 277BHS, GVWR 7600lbs. I did not weigh the truck and trailer but I'm sure the trailer was at least 8500 lbs with our gear etc. I did use a weight distribution hitch that was provided by the owner. It was set up for his Ford F-150 and not for my GMC. I'm sure I could have adjusted it to better control my rig but it worked OK. The only issue I had towing was bounciness on rough roads. If I were to own a travel trailer I would add air bags to the rear of my truck and make sure the weight distribution hitch was completely dialed in. The truck did a great job hauling my family of 4 and the trailer. I had plenty of power and I did not feel like I needed more engine at anytime during the trip. The overall comfort in the front seats was fine for long periods of time but the rear seats are too hard and too straight up and down to be comfortable for a long trip. My wife suggested GM could add a slide to the seat bottom so the seat bottom would slide a short way towards the front seats creating a reclining affect. Everything else in the truck worked well. The trucks GPS was slightly below par compared to google maps but it did get us from destination to destination and was OK while navigating. Using my voice to search for addresses etc did not work well. The voice calling also does not work well when trying to get a contact to pull up from my phones contact list. GM needs to fix this. I hand calculated my mileage at every fuel up using my trip meter and the gallons needed to fill the tank. I allowed the pump to run until it stopped then waited 20-30 seconds and ran it again until it stopped. I have attached a pic of the spreadsheet along with the trucks computer read out. In all I averaged 11.73 MPG over the entire 2039.2 miles of towing the trailer. The trucks computer average was 11.31 MPG. I hope this helps anyone who is curious about this truck and engine combo for towing.
  7. Sorry, I guess I misunderstood. Let's try oil cooler? Sent from my SM-N950U using Tapatalk
  8. Turns out it's a seal that goes from the intercooler to the engine. The seal isnon order...should be up and running Monday. My dealer has been great!
  9. It's not as bad as I thought. I got the truck towed to the dealer and had them drain the oil with me present so I could see how much it had left in it. It still had about 5 quarts (it takes 7). The oil was clean. The are now figuring out where the leak is. I will update when they find out.
  10. I am going to let them check it over. Its definately not the oil filter or the drain plug. The leak is somewhere above the oil pan. I could not see where it's coming from. It's just leaking a lot of oil. I will update when they tell me what's wrong. It's just incredibly frustrating to have a new truck with 300 miles on it and having a problem like this.
  11. I just dropped a ton of money on a brand new truck....one that should be free of major oil leaks. I'm really upset. Would you want a brand new truck that has this issue? Sent from my SM-N950U using Tapatalk
  12. So, I just bought a brand new 2020 Sierra SLT with the 3.0 Duramax. I drove it home last night from the dealership. It had around 200 miles on it when I picked it up. I drove it all day today and put about 100 more miles. The odo shows 316 miles. I parked it on my concrete garage pad and went into my garage and saw fresh oil on the garage floor where it had been parked. I looked under the truck and saw it dripping oil onto the garage pad. Then I saw another spot where I parked it yesterday for a short time, again more oil. I look under it and saw oil coming from somewhere above the oil pan but could not pin point the area of the leak. I then checked the oil and there was only a small oil mark at the very tip of the dipstick. I have to assume it's been leaking since it was built. There were no warning lights and it seems to be running fine. I did notice that the engine oild monitor showed only 75% life left? The dealership was already closed for the day. Any suggestions? I dont think I want a brand new truck that's been run dry of oil. Should I ask for a new truck or should I have this repaired and take the chance of future issues?
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