Best and MostReliable Engine

Hello all, we are considering a big GM SUV and want to know overall which engine is the best one for reliability? I want a suv with room and an engine that will be super reliable so I can sleep at night. I hear a lot about emissions issues and def issues with the diesel or lifter issues with the gas, but is this fixed now?

By your response, I'm assuming you mean a new one? If that's the case, then I don't really have anything constructive to say. Gas engines seem to have unexpected quality control errors. Diesel has all the emissions crap, but seems to be quite a runner from what people have said here.

However, I am a huge fan of the 6.2L non-AFM engines from 2007-09. I also like the 6.2L LT engines up to the 2020 model year with AFM turned off.

If price is not a barrier, I'd go with the diesel at this time. The current troublesome technology just to save a mpg or so with the gas engines is not worth the anxiety. But it would also depend on how long you intend to keep the vehicle. Diesel for the long run.

Nothing new is reliable , gas or diesel, from any manufacturer. It's been a race to the bottom for the cheapest parts and cheapest manufacturing processes for the last decade or so, everything has been outsourced and its all crap. So basically pick your favorite piece of junk. Its like cell phone providers, they all suck, yet we all still have one/ pay for them.

I'm a diesel guy usually (own three diesel trucks currently), but all the new diesels are absolutely crippled with DPF regens and urea injection. And if those totally useless systems go down, the truck will turn itself off and leave you stranded. Not to mention the silly belt driven oil pump that requires transmission removal to get to in the diesels.

If you want new, either plan to get rid of it before its out of warranty or buy the extended warranty because you'll most likely need it (and another car to get you around when the new one is in the shop).
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I'm a fan of the 6.2l also with AFM deleted. And to be honest the 5.3l hasn't let me down ever.

buckwild27 said:

I'm a fan of the 6.2l also with AFM deleted. And to be honest the 5.3l hasn't let me down ever.

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This is the 2021+ section, there is no AFM on these, its worse, its DFM . With DFM all the cylinders can deactivate and there are 17 different strategies that determine which cylinders turn themselves off when.
And bonus, each vehicle has its own code that needs to be broken to reprogram it, so mail order plug-in tuners just aren't a thing for these.
Deleting the DFM would require really expensive custom tuning for every individual truck, not to mention of course a new cam and 16 new lifters.
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Antonm said:

This is the 2021+ section, there is no AFM on these, its worse, its DFM . With DFM all the cylinders can deactivate and there are 17 different strategies that determine which cylinders turn themselves off when.
And bonus, each vehicle has its own code that needs to be broken to reprogram it, so mail order plug-in tuners just aren't a thing for these.
Deleting the DFM would require really expensive custom tuning for every individual truck, not to meaniton of course a new cam and 16 new lifters.
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I did forget to add the years of the 6.2l that I was referring to. But all of them are pre 21+

get a nice low mileage 2020 and cross your fingers, I won't be purchasing anything past 2020 myself, whole different ball game
perhaps a future design after the T2's just have to see how it goes.....
even the k2's have thinner metal, thinner paint but seem to be holding up ok otherwise
in any case get a higher trim that has sound proofing from the factory so ltz, denali, escalade, unless you really like to hear road noise

I guess we really lucked out with our 2019, maybe. Sales were real slow, got a super deal on the machine on the lot and it was exactly what we were looking for. For me it's like driving a bus but we bought it for a highway machine and we load it up and take off every so often.

> I hear a lot about emissions issues and def issues with the diesel

Where did you hear this?