6.6 Gasser

Teach · August 17, 2019

We could not take the uncomfortable front seats in our 16 Colorado LT any longer, every ride was torture. Had to purchase a full size truck so I decided to order the Silverado. Did not attend the International Auto Show in Manhattan last year so I have not seen the truck in person. Seen all the reviews by TFLT crew and like what I see. Have my eyes peeled open for the first one I see cruising down the parkway or the I 495 LIE. lol

CRApex · August 17, 2019

9 hours ago, Teach said:

DEF system failures mostly sensors, plugged up SCR and catalytic plugging. Soot from EGR contamination wearing out bearings, seals and rings. People not running them long enough, fast enough to keep the engine at operating temperature. Have students working the industry who report these failures to me. Bosch having issues with injector pumps and American diesel fuel on Duramax engines. Don’t know if it is all true just reporting what I have heard. Guess it is “buyer beware”. All this emission equipment has to take some toll on the engine longevity. I am a big believer in “By-pass” oil filtration and I do not run my trucks without one, more so with a diesel to filter out the carbon particulates from the engine oil. The new truck will have one installed the first week I own it.

Got it..I’m sure things happen, they just aren’t wide spread at all. The good part for me is the 100k warranty and I have yet to take one past that. What is fact is the unbelievable difference in towing capability and confidence with a Dmax, really why I prefer them.

CRApex · August 17, 2019

Well perhaps they will utilize the same 10spd that is paired up with the Duramax this year, then in 2 years you’ll be ready to go..

8 hours ago, Cowpie said:

Actually, even a diesel would benefit from more gears. The purpose of having more gears is to reduce the engine RPM spread between shifts. That is why I have an 18 speed in my semi truck. The top gear ratio of the 8 speed is similar to the 6 speed, and the 10 speed will be no different. Just like my 18 speed in my semi truck has virtually the same top gear ratio as a 10 speed.

But, given the track record of the 8 speed in the GM 1/2 tons, I would be more inclined to have the 6.6L gasser with the 6 speed. Even if they decide to go with a 10 speed, I would sit it out for a minimum of 2 years before considering just so they can get all the bugs worked out. I will be sitting out the 6.6L for at least 2 years for the same reason. So if while I am sitting out the .6.6 waiting for all the potential problems to get worked out, if they then come out with the 10 speed behind it, that will add an additional 2 years. I would have preferred they would have come out with both the L8T and the 10 speed at the same time.

Teach · August 17, 2019

If there are too many issues with the new 6.6 gasser I will simply trade it in for a newer model. Life’s too short to drive an ugly truck !! lol

Nothing pulls a load like a Diesel, they have the torque down low in the rpm band to get the job done. Totally love them over a gas engine. I am semi retired so it is difficult for me to justify the cost. But I definitely would prefer the Duramax!!

On the other hand I still remember the fun days I had building 427 Chevy big block and swapping them into GTOs. Those were great times !!

Cowpie · August 17, 2019

1 hour ago, CRApex said:

Well perhaps they will utilize the same 10spd that is paired up with the Duramax this year, then in 2 years you’ll be ready to go..

Possible. We'll see. The engine has to play out pretty well. It is a high bar that the 6.0L L96 set in terms of reliability, ease of maintenance, etc. And since I like using much cheaper E85 in my 2500, the new 6.6 is going to have to be a stone cold killer of a motor to entice me since from what I have read it is not being made flex fuel capable. I will remain open to watching how it all plays out. I am more than pleased with the 2015 2500 I have now. But if everything really looks good on the new offering, I could be enticed to consider a hard look at getting one. Right now, I am not even looking at one, just observing from the sidelines.

redwngr · August 17, 2019

18 hours ago, Teach said:

DEF system failures mostly sensors, plugged up SCR and catalytic plugging. Soot from EGR contamination wearing out bearings, seals and rings. People not running them long enough, fast enough to keep the engine at operating temperature. Have students working the industry who report these failures to me. Bosch having issues with injector pumps and American diesel fuel on Duramax engines. Don’t know if it is all true just reporting what I have heard. Guess it is “buyer beware”. All this emission equipment has to take some toll on the engine longevity. I am a big believer in “By-pass” oil filtration and I do not run my trucks without one, more so with a diesel to filter out the carbon particulates from the engine oil. The new truck will have one installed the first week I own it.

Bosch isn't used on the L5P (2017 and up).

They were on the 11 - 17 LML (cp4 version) and on the LMM prior to that (cps version)

Teach · August 20, 2019

Good to know that Bosch is no longer a player. After problems with my old Cummins ISB and the Bosch VP-44, I realize that Bosch does make junk also.

wcup102 · September 9, 2019

I'm riding the the fence now on a 19 or 20 2500. I like the the 3:73 gear is back as I always had 3:73's and they are a great all round gear for plowing and towing. The 4:10's made me leary as far as fuel mileage. I have never really gotten a straight answer from anyone around town what they get for mileage....12-19 depending on their driving as they say. Six gears with a bigger motor or 8 gears with the 6.0? Like a previous post mention, might wait to see what the bugs are in the new setup before deciding. I put on about 20k per year so it's a conundrum for me. Any feedback on your 15-19's would help. right now I have my first 1500 SLT Premium Plus, 2017 with the 6.2 and love the power, a little hot rod and the mileage is 18.9 to 21 driving 65-80 with mostly in town driving but I miss the 2500. I was never one for the "creature comforts" but I kinda have gotten use to them.....but I could do without too lol.

I thought I was ready to get out of one, but I was wrong. .Thanks

Sunshine39 · September 9, 2019

~~I,ve got a 2020 2500 SLT with about 100 miles on it.~~

~~Pulled out 6500 pound camper and got about 9.8 mpg. Same as out 2001 1500 with a 4.8 engine. But in all honesty, this truck doesn't seem to even know there is a trailer behind it.~~

~~Most of our driving is short stop and go traffic of maybe 1-6 miles so gas mileage is not good. Says 10+.~~

~~On the road during the first 500 mile without the trailer we got best 21.6 but mostly in the 17-18.~~

~~I put this monster on the CAT scale Sat and it was 7080# with 1/2 tank of gas.~~

~~I like all the camera's and safety features but sure miss the size of my 2001 1500 Silverado.~~

~~As an only vehicle it is a challenge in small parking lots.~~

~~Did put 2" drop shackles to help load and unload but have not been able to bend the pinch welds enough to stop them hitting the springs causing the squeaking.~~

~~Good luck with your decision.~~

~~Note: do not know why the lines in the message.~~

davester · September 9, 2019

4 hours ago, Sunshine39 said:

I,ve got a 2020 2500 SLT with about 100 miles on it.

Pulled out 6500 pound camper and got about 9.8 mpg. Same as out 2001 1500 with a 4.8 engine. But in all honesty, this truck doesn't seem to even know there is a trailer behind it.

Most of our driving is short stop and go traffic of maybe 1-6 miles so gas mileage is not good. Says 10+.

On the road during the first 500 mile without the trailer we got best 21.6 but mostly in the 17-18.

I put this monster on the CAT scale Sat and it was 7080# with 1/2 tank of gas.

I like all the camera's and safety features but sure miss the size of my 2001 1500 Silverado.

As an only vehicle it is a challenge in small parking lots.

Did put 2" drop shackles to help load and unload but have not been able to bend the pinch welds enough to stop them hitting the springs causing the squeaking.

Good luck with your decision.

Note: do not know why the lines in the message.

The lines are through all your text because the "strikethrough" option was selected for the text (4th button from the left at the top of the quickreply area).

SkidooSteve12 · September 11, 2019

On 8/16/2019 at 11:27 PM, Teach said:

DEF system failures mostly sensors, plugged up SCR and catalytic plugging. Soot from EGR contamination wearing out bearings, seals and rings. People not running them long enough, fast enough to keep the engine at operating temperature. Have students working the industry who report these failures to me. Bosch having issues with injector pumps and American diesel fuel on Duramax engines. Don’t know if it is all true just reporting what I have heard. Guess it is “buyer beware”. All this emission equipment has to take some toll on the engine longevity. I am a big believer in “By-pass” oil filtration and I do not run my trucks without one, more so with a diesel to filter out the carbon particulates from the engine oil. The new truck will have one installed the first week I own it.

Which By-pass oil filter would you recommend? I've never used one.

SkidooSteve12 · September 11, 2019

On 9/9/2019 at 4:31 AM, wcup102 said:

I'm riding the the fence now on a 19 or 20 2500. I like the the 3:73 gear is back as I always had 3:73's and they are a great all round gear for plowing and towing. The 4:10's made me leary as far as fuel mileage. I have never really gotten a straight answer from anyone around town what they get for mileage....12-19 depending on their driving as they say. Six gears with a bigger motor or 8 gears with the 6.0? Like a previous post mention, might wait to see what the bugs are in the new setup before deciding. I put on about 20k per year so it's a conundrum for me. Any feedback on your 15-19's would help. right now I have my first 1500 SLT Premium Plus, 2017 with the 6.2 and love the power, a little hot rod and the mileage is 18.9 to 21 driving 65-80 with mostly in town driving but I miss the 2500. I was never one for the "creature comforts" but I kinda have gotten use to them.....but I could do without too lol.

I thought I was ready to get out of one, but I was wrong. .Thanks

I searched for about a month for a nice used 2018-2019 2500 6.0L with low miles and the options I wanted, which included front bench seat with heated seats, remote start..... blah blah nice options. I had a couple picked out but my dealer couldn't get the other dealers to work with him on a deal. My plan was to get a nice truck that someone was trading in on a new 2020. My dealer told me he'd find me a nice truck, and I knew he would, but I was impatient and constantly looking and emailing him used trucks to check on. My wife finally asked what he had on the lot and his 2020 Gasser on the lot fit almost all of my option "wants". Originally we didn't want a first year motor and chassis.... but I also didn't want to spend nearly the same amount of money on "old technology" knowing I'd keep the truck for 6-8 years. So I test drove a 2020 Gasser LT nicely loaded for the weekend putting about 130 miles on it, hooking it up to my boat and snowmobile trailers... and decided to buy it. I only drive about 12-15K miles a year and have been disappointed with the average 14 MPG with our 2013 Silverado 1500 CC since we bought it new and put 92K miles on it. So whatever MPG this new 6.6L gets will not phase me. I'm scheduled to pick it up on Friday.

Teach · September 11, 2019

51 minutes ago, SkidooSteve12 said:

Which By-pass oil filter would you recommend? I've never used one.

I have been using a Amsoil by pass system on every truck I have owned since 1986.

Cowpie · September 12, 2019

11 hours ago, Teach said:

I have been using a Amsoil by pass system on every truck I have owned since 1986.

Amsoil does indeed make a very good one. I have been using a FS-2500 bypass for about 12 years on two different diesels. My Detroit 60 12.7L now has 1,015,564 miles / 22,005 hours and it is all original except for a water pump. Only uses about 1 qt of oil every 11-12,000 miles. A good bypass unit will keep alot of that soot out of the oil. The oil will still get black quick, but the actual percentage of soot in the oil will be substantially lower by using a bypass filter. And that will help the longevity of the engine.

There is another that I haven't heard talked about much but is also a great unit to get soot and particulates out of the oil. Spinner II. That might be worth taking a look at also. I didn't hear about it until after I had already went with the FS-2500. I might have considered the Spinner II. Their model 25 would be the one for a pickup diesel.

Doesn't matter which one you choose. They all do a great job. Just get one if you have a diesel engine.

wcup102 · September 12, 2019

On 9/11/2019 at 12:35 PM, SkidooSteve12 said:

I searched for about a month for a nice used 2018-2019 2500 6.0L with low miles and the options I wanted, which included front bench seat with heated seats, remote start..... blah blah nice options. I had a couple picked out but my dealer couldn't get the other dealers to work with him on a deal. My plan was to get a nice truck that someone was trading in on a new 2020. My dealer told me he'd find me a nice truck, and I knew he would, but I was impatient and constantly looking and emailing him used trucks to check on. My wife finally asked what he had on the lot and his 2020 Gasser on the lot fit almost all of my option "wants". Originally we didn't want a first year motor and chassis.... but I also didn't want to spend nearly the same amount of money on "old technology" knowing I'd keep the truck for 6-8 years. So I test drove a 2020 Gasser LT nicely loaded for the weekend putting about 130 miles on it, hooking it up to my boat and snowmobile trailers... and decided to buy it. I only drive about 12-15K miles a year and have been disappointed with the average 14 MPG with our 2013 Silverado 1500 CC since we bought it new and put 92K miles on it. So whatever MPG this new 6.6L gets will not phase me. I'm scheduled to pick it up on Friday.

Congrats! Did you pay attention to the mileage when hooked up to your trailers. just curious? I had a 2011 6.0 2500 crew that got around 14 as a rule which I was OK with but tht also had the 3:73's......the only thing that concerns me with the '19 or older is the gas mileage with the 4:10 gears. It's hard to find people that have an accurate accounting of their mileage with one of those LOL