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    2018 GMC Sierra SLT 6.2L Max Tow

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LDM's Achievements


Enthusiast (4/11)



  1. I run full synthetic 5W30 in my 6.2L. 0W20 is only for CAFE reasons. If you want to use a thicker oil, do so, it isn't going to hurt the engine despite all the claims some will make to the contrary.
  2. My guess will be 2500/3500 with the CNG/LPG conversion for the 6.0 engines. You could order them directly from GM with the conversion equipment installed, not sure if the 6.6 gas has that option these days. Gas mileage is definitely lower than gasoline but if you have access to easy CNG/LPG filling it can definitely be worth. I know the garbage trucks in my area run of CNG these days, they have big signs on the side of them advertising that fact.
  3. Yep, just like everything else in Illinois. I always say the same thing, Illinois would be a great place to live if we didn't have Chicago. But unfortunately the rest of the state gets to suffer with Chicago's greed and corruption ruining the state. Also, wish the E85 was that cheap by me. Then it wouldn't even be worth considering running premium with that price spread, E85 would be a winner without even having to calculate it.
  4. Yeah, I'm going to test some other ethanol levels with it as well, see how accurate it is. 72% on the sensor vs 80% on the vial tester isn't too far off, but it never hurts to verify. I also might have put a little too much water in as well, so its only as accurate as the user doing it right too.
  5. Well I filled up today with e85 and did a couple of data logs before and after. Shows about a 5-10 HP at WOT vs premium and an ethanol content of about 72%. 5-10 on the data log isn't a huge amount and it was only a couple of comparisons so nothing to major to get excited about there. Biggest question will be the mileage vs the cost, which I won't know for a while as I'm not taking an major trips currently and most of my driving is local. Only thing I did notice after the fill up is that the idle seems to be smoother, both by feel and by less jumping around in the timing in the data log. I'll continue with some logging and see what else I see while I run this tank. The ethanol tester I bought showed around 80% so not sure which one is more accurate, the sensor on the truck or the tester.
  6. Yeah, if I could run 87 without any issues then it wouldn't be worth it. The cost difference around here is about 20% for E85 vs premium, so depending on the mileage it may come out ahead. I don't plan on tuning the truck just to run on e85 so I can always switch back to premium if I find out it doesn't work out for cost saving.
  7. No kit, I just bought the alcohol sensor, a plug for the sensor, and the fuel line. Wasn't overly expensive, the sensor was around $50, the plug around $25, and the fuel line around $30. I also had to buy the VDF file and the security seed key for my OBD2 Tunercat program, which was $80 and $45 as well. But now I can also tune my truck and any other 2014-2019 truck (although 17+ all require a $45 security seed key as well) so its worth it. And now I can do all the other tuning on the truck, except for the TCM since Tunercat doesn't support the T87A yet.
  8. Finally was able to do the E85 conversion on my 2018 Sierra 6.2 on Sunday after receiving the fuel line I needed. Everything went together just fine although I had to length my connection harness to make it go to where I needed it to for the sensor. After uploading my e85 enabled tune with Tunercats OBD2 (yes, I have a Roadrunner for the 411 PCM and the full version of TunerCats OBD2 RT Tuner), I was able to see about 8.6-9.0 alcohol content in my current tank of gas. I plan on filling up with E85 when I get down to less than 1 gallon and then will see how the truck both performs and how much it costs per mile to operate. Right now E85 is around 20%+ less expensive than 91+ premium here so depending on the trade off in fuel economy it may end up being cheaper to run. Also interested to see the data logs for any performance difference as the L83 gets a good 20+ HP and TQ when using E85 in the flex fuel vehicles. Still not sure why GM didn't make the L86 flex fuel in the first place, since the only thing it lacks is the alcohol sensor and the few things in the tune enabled for use.
  9. All this stuff is is thick oil without any of the proper additives. If you want a thicker oil, use a thicker oil to begin with. No need to add this useless stuff. The only thing its good for is making your wallet lighter.
  10. This is the funniest thing I've read in a long time. Towing with an electric vehicle is a joke. Let me know when you can tow 300+ miles with an electric vehicle and not have to wait days for it charge back up.
  11. The manual is very clear on the answer. Dexron VI.
  12. Went from a 15 Sierra 5.3 to my current 18 Sierra 6.2 with max tow and I love it. If you want more power, the 6.2 definitely has it. I don't do a lot of towing but I do some and the extra power with the max tow definitely helps. I don't really notice any difference in fuel economy either from the 5.3, although it does require premium fuel while the 5.3 can run regular without any issue.
  13. When my 95 Tahoe finally blew a head gasket a few years ago I decided to get a newer truck. Ended up buying a 2015 Sierra 1500 with the 5.3 and 6 speed transmission. It was a good truck and I towed with it a few times but I really wanted the 6.2, it was just difficult to find one in a double cab or crew cab with the 6.5 foot bed so I settled for a 5.3 as I needed a general purpose vehicle (my Camaros are garage queens). After a while the dealer I bought my 15 from ended up getting in an 18 double cab with the 6.2, 8 speed, and max tow package, in black, which was what I really wanted from the beginning. After some negotiating I was able to get a good deal for trading in my 15 for the 18. Love the 6.2, although I did have the hard 1-2 shift not long after purchasing it. The dealer did the TSB for it and haven't had the issue since. Gas mileage isn't really any different with the 6.2 that I can tell, although I do have a tendency to drive the 6.2 faster since she has a bit more get up and go than the 5.3
  14. As an IT professional there actually can be a reason why you would want a computer or chip to be at a temperature like that and that is to keep it at a constant temperature for operation purposes. It has generally been cheaper and easier to keep a temperature above room temp, so in most cases this is what was done. However, in this case I sincerely doubt that GM designed the TCM to be at a constant operating temp of 200F, they just did it to make it easier in some way to build it on the line. Its not like its an old core memory or bubble memory module that can only operate at a designed temperature.
  15. Agreed. I spent an hour and half in the morning clearing my driveway and then another 45 minutes later in the day. I've had this same snow blower for over 15 years and aside from putting gas in it and changing the oil, it starts first pull every time. No battery is going to last 15 years, especially when some years I don't even have to use it because we don't really get any snow. There are certain devices that work great with batteries, like my black and decker cordless drills, weed eater, and reciprocating saw. But when it comes to something like a truck that actually gets used for towing and work, batteries are just about useless to power something like that.
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