BREAKING: GM is officially recalling the L87

[jfoj]

I know what I would do!

Take matters into your own hands.

Really nothing more than a free oil change.

If you can DIY, you can probably do the oil change for $50-$70 depending on the oil, pricing and any rebates or discounts.

I go a bit on the higher end, while not "officially" Dexos approved it would pass without any issues. Higher end oil is not usually submitted for certain approvals because the vendors would need to provide the formulation and this is intellectual property many vendors do not want to surrender on their upper level products.

 

[KMeloney]

The difference is DMF can operate on as few as 1 cylinder

Is this true? 1 cylinder? (Not a rhetorical question, btw.) Or is that theoretical? Just seems impossible (or just impossibly stupid) from an engineering standpoint that the truck could be motivated at all on 1 cylinder.

 

[Vladimir2306]

AFM and DFM does work both on the highway and all conditions. It works even as slow as 20 MPH, I have monitored and you can even hear the changes at the vehicles drive around if you are behind them. You CLEARLY do not understand how AFM/DFM functions.

The difference is DMF can operate on as few as 1 cylinder, AFM operates on as few as 4 cylinders. Seems the MAJORITY if the failures are at highway speed when the DFM is possibly trying to run on as few as 1 to 3 cylinders and is actively dancing around during all of the combinations. Putting all the load on between 1 and a few cylinders.

Dfm works not on one cylinder, but on two, or more, and you can't understand how many cylinders are working at the moment)) and the dashboard does not show the number of working cylinders in any way))) so most likely you receive some other sound))

 

[KMeloney]

Just talked to my dealership about my Escalade. According to them, no parts are available right now, no work can be done right now, the dealership cannot do anything right now. They aren't going to do anything for the moment. The guy told me to wait until I receive a letter in the mail with further instructions.

Meanwhile, I've got an alert in the MyCadillac app saying "dealer will inspect and as necessary, repair or replace the engine??!?!!?"

What the hell are we supposed to do?

I got the same exact response from my service manager -- but with the addition of the belief that they're going to be told by GM to just replace the engines on the list.

 

[Vladimir2306]

Is this true? 1 cylinder? (Not a rhetorical question, btw.) Or is that theoretical? Just seems impossible (or just impossibly stupid) from an engineering standpoint that the truck could be motivated at all on 1 cylinder.

No, of course, he says nonsense, dfm does not work on one cylinder)))

 

[jfoj]

Is this true? 1 cylinder? (Not a rhetorical question, btw.) Or is that theoretical? Just seems impossible (or just impossibly stupid) from an engineering standpoint that the truck could be motivated at all on 1 cylinder.

Yup, impossibly stupid just 1 cylinder!! And not just the same 1 cylinder every time, it jumps around, but unclear really how random it could be.

I have also seen reference to running on 2 cylinders.

So you tell me what this means "but DFM actively turns off any number of cylinders in a variety of combinations"

There is not as much information out there about 100% how the DFM operates other than is has like 17 different operation modes.

I do know for sure that under DFCO (Decel with Fuel Cutoff) they do seem to shut all cylinders down with DFM, or at least in some order this does occur because I have watch the cylinder deactivation counts.

DFM Operation

DFM Overview

 

[suburbansince87]

I just replaced the oil in my wife's '22 6.2L over the weekend... with 0W-20. Wish I had kept up with this forum

 

[DontTaseMeBro]

I just replaced the oil in my wife's '22 6.2L over the weekend... with 0W-20. Wish I had kept up with this forum

You'll be fine. Just don't put more than 3k miles on it.

 

[Vladimir2306]

Yup, impossibly stupid just 1 cylinder!! And not just the same 1 cylinder every time, it jumps around, but unclear really how random it could be.

I have also seen reference to running on 2 cylinders.

So you tell me what this means "but DFM actively turns off any number of cylinders in a variety of combinations"

There is not as much information out there about 100% how the DFM operates other than is has like 17 different operation modes.

I do know for sure that under DFCO (Decel with Fuel Cutoff) they do seem to shut all cylinders down with DFM, or at least in some order this does occur because I have watch the cylinder deactivation counts.

DFM Operation

DFM Overview

By the way, where did you get the information about the constant load on the engine in the city of 70-80%? Here is the load schedule, I am now driving around the city in the mode of 10-20-30 miles per hour. 70% is the peak when I accelerated a little, and so the average load is 25-30%
When you release the gas pedal, the engine stops supplying fuel to the cylinders at all, haha, you confuse DFM work with forced idling, or this is known as coasting. This was done on carburetor engines)))

 

[Marky Dissod]

DFM has V8, V7, V6, V5, V4, V3, V2, I2, & 0-cylinder modes.
Total of seventeen different possible firing orders, constantly changing.
The exact same firing order is never consecutively repeated.

Each cylinder's duty cycle is kept as close as possible to identical to each other,
compared to Engine Half@$$, basically a part-time V4 sharing a crank with a fulltime V4.