All gas engines have it......except the 6.6L gas in 2500/3500.

You said New and I assume you are referring to new, not new to me?

 

I’m looking at a 2021 GMC Sierra 2500 gas and was hoping for it to not have a AFM

I currently have a 2009 Silverado 1500 and have already had to change the engine because of the AFM and don’t plan to buy a truck with the same problems

 

I’m looking at a 2021 GMC Sierra 2500 gas and was hoping for it to not have a AFM

I currently have a 2009 Silverado 1500 and have already had to change the engine because of the AFM and don’t plan to buy a truck with the same problems

You will be good with that 2021 Sierra 2500 gas engine.

As mentioned the 2500 gas trucks don't have AFM/DFM

 

1999-2007 silverados didn't have AFM/DOD junk.

 

My ‘21 sierra was ordered without. I would just plug in a Range Delete and call it a day. My 08 silverado had one and no issues for the 163k I drove it.

 

I’m looking at a 2021 GMC Sierra 2500 gas and was hoping for it to not have a AFM

2021 comes with only 1 gas engine, the 6.6L. It replaced the 6.0L engine

The L8T (6.6L) does not use GM fuel saving technologies such as Active Fuel Management (AFM), Dynamic Fuel Management (DFM), or Auto Stop-Start (ASS).

 

My 8.1 doesn't. It gets a solid 10.5 mpg city too. 🤣

But what everyone else said is correct. The 6.6 in the 2500 and 3500 don't have AFM or other MPG 'tricks'. The main reason for that is that the 1/2 tons are class '2a' (under 8,500 GVWR) as defined by the Federal Highway Administration and have to adhere to stricter EPA requirements. 3/4 ton pickups are class '2b' (8,051 - 10,000 GVWR) and have much less stringent EPA requirements. 1 tons are class '3' (10,001 - 14,000 GVWR).

 

L92 used in 2007 and 2008 6.2L's

 

Day gone everyone! 4.8L does not have it! hello!!! Don't just type in stuff and say all of them have it.

 

Day gone everyone! 4.8L does not have it! hello!!! Don't just type in stuff and say all of them have it.

There was one 4.8 that had it. I'd have to look up the RPO code for it. They didn't make many of them tho.

And plus they don't make a 4.8 anymore. It's either 6.2 v8 5.3 v8 or 4.3 v6. And the 4.3 has DOD.

 

Quart low. I read many AFM and youtubes about excessive oil consumption.
The fix was, a spay nozzle in oil pan mod, new updated valve covers with slotted holes and finally a Ranger 8 cyl mode ECM module.
I did updated valve cover and ECM defeat and thought I had a fix.
No smoke or drips so I may get the compression checked and look for wet or fouled plugs or both.

I will add this. I tried to find a Toyota Tacoma yesterday and they are all 25k used with 130k miles. 2011 etc They also lowballed my Silverado big time at 3k for a trade. I figure I can keep my trick and get a new engine for 5k and be 20k ahead vs the Toyota cult Kool aide . I don't want to blow up my 5.3l and now maybe will get a AFM delete with new cam/lifters top manifold valley plate and tune at a shop to remove AFM yet its got 135k miles on it.

 

Quart low

Quart between oil changes? What is your oil change interval? If the usual 5-6K, I wouldn't call a quart "excessive". Consumption, yes, but not excessive, per se.

 

If i remember correctly, GM claims 1 quart per 1500miles is considered normal.
So if your consumption is only 1 quart in 5000+ miles, that's pretty dang good.

My truck used 3 quarts driving 1100 miles and idling for 5 days.
Topped it off and hauled a 9400# trailer 640 miles and hammered down heading home another 700ish miles turning 3200rpms for several hours (slightly excessive mph).
Got home and had to add 2 more quarts. Which doesn't bother me at all. At this rate i never have to change the oil is the way i look at it.
And by end of next year the engine should have 500k miles on it.

 

Well, since I typed that last one in I called a good Chevy mechanic.
I live off Hwy 99 in seattle and it is the most bizarre auto dealer, body shop, repair shop used car lots place I have ever seen. Hundreds.
Anyway, he confirmed what all you just said. A quart is not bad and he told Chevy me that says that is normal. After all this I am keeping this truck. I have that
Ranger AFM blocker in the ECM so the lifters will never collapse anymore and get stuck in the shortened state.
This Toyota deal journey I put myself on kind of blew my mind. Now I may even get another 5.3l Silverado to mess with it! A hobby rig so to speak.
Thanks for all the comments by the way.

 

Why not just solve your problem for almost free? HERE'S HOW:
Buy Valvoline RESTORE & PROTECT SYNTHETIC MOTOR OIL. Install a new filter. AT 500 miles, change the filter At 1000 miles change the filter again. This oil cleans out the sticky ethanol by-products that are causing your oil control rings to fail to clean off the engine oil effectively on the cylinder walls. THIS VALVOLINE WORKS! My 5.3 went from using 1 qt every 1,000 miles to using 1/2 qt every 2,000 miles.

I have rebuilt Chevy engines that have and discovered that ethanol makes all of your crankcase parts very sticky. It's like someone spilled Coca Cola inside your engine and didn't clean it up. This prohibits your oil control rings from doing their jobs. Another factor is that Chevy uses oil squirters on the bottom side of the pistons and they are really spraying a lot of oil on the cylinder walls, much more than previous designs. These squirters are necessary with direct injection, so you must keep that sticky residue out of your crankcase. Only Valvoline Protect and Restore oil cleans it up.

I do not work for Valvoline or receive any compensation for this advice. I am simply trying to help you. BTW my 5.3 ate a non-AFM lifter at 248,000, and I rebuilt my own engine. I got rid of the AFM and went with conventional lifters, and gas mileage is about the same. I really cannot tell any difference. I can still get 24 on a highway run.

 

What about the oil consumption issue with the 6.6 liter?