L87 Range Techology inline DFM disabler

[tom082551]

I own a 2022 Tahoe High Country with a 6.2 liter motor. I purchase it in Jan of 2023 with 9700 miles on it. I have an Airport Ride Service. Just after I purchased it, I read about high oil consumption and had the dealer run a consumption test. It uses 2-3 quarts between oil changes which I have NEVER experienced, but GM claims that is normal. I disagree ! I was born in Detroit, and have been a gearhead my entire life! I’m 74 now. Have always performed my repairs and such! Engines do not consume that much oil unless it is blowing by the valve guides, rings or has a leak? So now the issue with the lifters and crank is the current topic. GM stopped using the 6.2 now. My engine runs fine other than oil consumption. So with this engine having AFM/DFM the engine goes from running on 8 cylinders to 6 cylinders to 4 cylinders with auto start/stop (which I disabled). No wonder they are having problems! The poor engine has trouble figuring out whether it’s an eight or six or a four-cylinder, which shifting and down shifting and in and out of 68 and four-cylinder, put stress on the engine. So? I just installed the range inline DFM disabler. Very simple install and engine runs fine, so I’m hoping for longevity as I already have 84,000 miles on it. Any feedback???

 

[Marky Dissod]

I own a 2022 Tahoe High Country with a 6.2 liter motor. I purchase it in Jan of 2023 with 9700 miles on it. I have an Airport Ride Service.
Just after I purchased it, I read about high oil consumption and had the dealer run a consumption test.
It uses 2-3 quarts between oil changes which I have NEVER experienced, but GM claims that is normal.
I disagree! I was born in Detroit, and have been a gearhead my entire life! I’m 74 now. Have always performed my repairs and such!

Don't matter if you're some tart who thinks that GM forgot to update the 710 cap,
MAXIMUM ONE QT between oil changes damnt.
Reduce oil change interval length til 1qt or less between changes, nevermind the Oil Life Monitor.
Do you perform your own repairs and maintenance NOW?

Engines do not consume that much oil unless it is blowing by the valve guides, rings or has a leak?

Or the PCV system has issues, or was designed by a schmuckdiot, or the oil changes are too far apart.
Ever considered a catch can? They reduce oil consumption and keep the intake valves cleaner.
You may also consider using fuel system cleaner with PEA before each oil change.

with this engine having AFM/DFM the engine goes from running on 8 cylinders to 6 cylinders to 4 cylinders with auto start/stop (which I disabled).

Doubt it's Engine Half@$$ / AFM / V8 or V4 mode;
more likely Cylinder Confusion / DFM / V8 or V7 or V6 or V5 or V4 or V3 or V2 or I2 mode.

V8-6-4 was a DIFFERENT schidty solution with its own different schidty problems (valves were never disabled!);
despite the conceptual lineage, V8-6-4 is not diagnostically relevant to Displacement on Demand or Dynamic Skip Fire.

Any feedback?

Very good that you disabled Engine A.S.S. and Cylinder Confusion.
I'd switch to Valvoline Restore & Protect 5W30, despite that they aren't paying me to say that (am I a cheap slure?).
Been using V-R&P 5W30 for three oil changes now, and my mechanic was CONVINCED that I bought a brand new dipstick.
Hey, if it's gonna consume oil anyway, let it consume oil with a cumulative cleaning effect.
Also 5W30 will always get consumed less than 0W20 under otherwise equivalent conditions.

 

[Joseph Garcia]

I own a 2022 Tahoe High Country with a 6.2 liter motor. I purchase it in Jan of 2023 with 9700 miles on it. I have an Airport Ride Service. Just after I purchased it, I read about high oil consumption and had the dealer run a consumption test. It uses 2-3 quarts between oil changes which I have NEVER experienced, but GM claims that is normal. I disagree ! I was born in Detroit, and have been a gearhead my entire life! I’m 74 now. Have always performed my repairs and such! Engines do not consume that much oil unless it is blowing by the valve guides, rings or has a leak? So now the issue with the lifters and crank is the current topic. GM stopped using the 6.2 now. My engine runs fine other than oil consumption. So with this engine having AFM/DFM the engine goes from running on 8 cylinders to 6 cylinders to 4 cylinders with auto start/stop (which I disabled). No wonder they are having problems! The poor engine has trouble figuring out whether it’s an eight or six or a four-cylinder, which shifting and down shifting and in and out of 68 and four-cylinder, put stress on the engine. So? I just installed the range inline DFM disabler. Very simple install and engine runs fine, so I’m hoping for longevity as I already have 84,000 miles on it. Any feedback???

I would be very interested in knowing if the use of this device lowers your current oil consumption.

 

[fondupot]

Coming from first hand experience, I can say the Range DFM disabler module is a MUST HAVE for any any GM V8 engine equipped with AFM/DFM.

I have a 2021 Yukon 5.3L that I purchased in October 2024. I drove the truck a few months before installing the Range module and I found that when DFM was engaged, there was a slight but noticeable unpleasant drive-train vibration that you could feel in the cab. While driving in L9 mode is a free solution for locking out the DFM from engaging, I still wanted a "set it and forget" fix. That's where the Range comes in.

After installing the Range module, no more DFM engagement (tested with a scan tool), no more drive-train vibration, and the added bonus of no more start-stop, since the Range also takes care of that. There has been considerable discussion on this forum regarding the module, with some negative feedback, but my overall experience with it has been highly positive and I would recommend it to anyone wanting to get rid of DFM and Auto Start/Stop. While it does nothing for the mechanical components that are used in the engine for DFM, I am still please with the electronic disabling of the system for now. And maybe down the road, do a full DFM delete...

In previous generation 5.3 and 6.2, I have read that the Range AFM module has been able to reduce oil consumption in those engines. However I can't comment on oil consumption, since my 2021 Yukon L84 5.3 doesn't use any oil. Currently has around 65,000 miles on it. I check the oil level every couple hundred miles, and on the last oil change I drained out damn near a full 8 quarts of oil. Very happy with this truck.


This is my install video for the range module, in case anyone is looking to do it themselves.

 

[Scarey]

I believe it does not work on 2025 models. Yes I agree it’s the best solution for the 21-24 models years.

 

[JKeller]

Both my 2015 (5.3L) and my 2021 (6.2L) consumed oil when using the recommended 0-20W oil. Both almost completely stopped consuming oil when I switched to 30 weight oil.

 

[tom082551]

I would be very interested in knowing if the use of this device lowers your current oil consumption.

Not sure? I will monitor it?

 

[Vladimir2306]

The DFM deactivator does not affect oil consumption in any way. One of the reasons for oil consumption is a leak in the sealant on the valve cover, approximately 1 inch long; since 2024, corrected valve covers have been introduced. Again, oil consumption occurs when you drive actively, pressing the gas pedal or quickly on the highway. There is no oil consumption in a quiet city driving mode.
I start to lose oil at about 2,500 miles, and I add about 0.5 quarts. And then every 600-650 miles, another 0.5 quarts. So over a 7,000-7,500 mile period between oil changes, I add about 4 quarts. And I don't worry about it. But I just drive fast, really fast. My highway driving is 95-100 mph.

 

[Silverado4x4]

The DFM deactivator does not affect oil consumption in any way. One of the reasons for oil consumption is a leak in the sealant on the valve cover, approximately 1 inch long; since 2024, corrected valve covers have been introduced. Again, oil consumption occurs when you drive actively, pressing the gas pedal or quickly on the highway. There is no oil consumption in a quiet city driving mode.
I start to lose oil at about 2,500 miles, and I add about 0.5 quarts. And then every 600-650 miles, another 0.5 quarts. So over a 7,000-7,500 mile period between oil changes, I add about 4 quarts. And I don't worry about it. But I just drive fast, really fast. My highway driving is 95-100 mph.

Damn, you dont have speed limits over there? 100mph is that converted from kph?

 

[Vladimir2306]

Damn, you dont have speed limits over there? 100mph is that converted from kph?

We have speed limits of course . But we have built great highways where the speed limit is 130 km/h or 81 miles per hour. But we drive on these highways as fast as the car allows. For example, in my previous Mercedes GLS I drove the distance between Moscow and St. Petersburg, 630 km, in 3 hours 45 minutes, with an average speed of 168 km/h or 105 mph average speed for the entire distance. I was driving 220-240 km/h most of the time, that's 150 mph for almost 4 hours)
As for the Yukon, I drove it 675 km at an average speed of 155 km/h, moving almost the entire time on cruise control at a speed of 170 km/h.
The point is simple. Fines and cameras are not about safety, they are about government revenue. And here they realized that it is easier to build a cool, high-quality highway and not install cameras so that people move quickly between cities, than to collect fines from this highway. Again, the fine for driving at 170 km/h, where the limit is 130 km/h, is about 5-6 dollars. Even if you get 3-5 such fines for a vacation trip, you treat it as an extra charge for driving on the roads)))

 

[tom082551]

Not sure? I will monitor it?

No, has no effect on oil consumption . I took my car to the dealer for them to check my 6.2 L motor for recall. A lot of those motors were bad and they’re replacing the motors, but mine was OK. So while up on the rack, there was another recall for a software upgrade. The tech told me that they had a glitch and couldn’t load the software because a whole bank of fuses was not functioning. So I asked him if it could be that DFM that I installed, and I showed him where it was told him how to remove it. They told me my car wouldn’t be ready till the next day so I’m off to enterprise to get a rental car and get the whole thing said and done I’m getting ready to get in the rental car and the dealer calls me and tells me my car is done that the device is in the ashtray so yesterday I reinstalled the device. If anything, it may affect the fuel economy, but you know I love it because now it’s a V8 it has no gender identity problems. It is a V8 and it also deactivate the automatic shut off for traffic lights so I’m all in on this device and it’s so simple this time I didn’t have to even undo the fender liner if you turn the tire hard to the right and you get on your back and scoot under there and somebody helps you hold the belt liner back underneath. You just peel back the liner and it’s right there. Piece of cake very simple so now it’s back to where I want it and I’m a happy man but as far as oil consumption no they still use oil.

 

[jerry455]

I have had one installed in my 2021 Suburban HC for about a month now. It is working great. I started using 0W30, when I bought the truck just over a year ago and am using 0W40 now. I have never had an oil problem. It barely uses any and I have almost 92,000 miles on it. I have not noticed any reduction in fuel economy but I put a better flowing muffler on the truck.

 

[fondupot]

My 2021 5.3L doesn't use any oil. I use 0W20 Amsoil. I check the level every week, it doesn't ever move.

 

[SavageDad]

My 2021 5.3L doesn't use any oil. I use 0W20 Amsoil. I check the level every week, it doesn't ever move.

I ran the same oil and I'd get the add a quart warning on my dash about two times per oil change, switched to the 0w40 from Amsoil and I'm still at one per oil change.

 

[Vladimir2306]

I ran the same oil and I'd get the add a quart warning on my dash about two times per oil change, switched to the 0w40 from Amsoil and I'm still at one per oil change.

If you drive fast, it's okay. our engines consume oil when driving actively.

 

[Marky Dissod]

If you drive fast, it's okay. our engines consume oil when driving actively.

That 'normal' oil consumption can be minimized or nearly negated by:
keeping the PCV passages clean
changing oil & filter before the engine consumes more than 0.5Qt / 0.5L (as motor oil ages during use it becomes more likely to burn or be consumed)
*using 0w30 / 5w30 or 0w40 / 5w40 motor oil*

*0w20 / 5w20 inherent characteristics make it more susceptible to burning and consumption compared to 0w30 / 5w30 or 0w40 / 5w40.

 

[RST Dana]

Previously I had posted about my 21 using oil with 55k miles. After performing the oil consumption test over several weeks/miles. The issue was confirmed to be legit. My dealer was great and replaced pistons and rings, etc. They have me a 25 Tahoe Premier as a loaner and all I paid was the $100.00 deductible.

 

[SavageDad]

If you drive fast, it's okay. our engines consume oil when driving actively.

Unfortunately I don't, I occasionally set cruise at around 80 on the freeway if I'm tired or in a rush, but most of the time I set it around 65-70 and I just cruise trying to maximize fuel economy.

 

[SavageDad]

Previously I had posted about my 21 using oil with 55k miles. After performing the oil consumption test over several weeks/miles. The issue was confirmed to be legit. My dealer was great and replaced pistons and rings, etc. They have me a 25 Tahoe Premier as a loaner and all I paid was the $100.00 deductible.

...yeah I need a dealer like that around here. Every single time I've brought the truck in for a noise or issue they tell me that they'll need the truck for a minimum of three days just to diagnose it and they can't guarantee that they'll have a loaner available at all not a comparable loaner, a loaner period.

 

[Scarey]

Looks like range works on ‘25 and ‘26.