Most Reliable GM Truck Engine

GN2018 · January 19

I’m looking for a truck/suv for my daughter. She tows a small trailer so I would prefer a towing package however, my biggest concern is what engine to get. My fear is her getting an engine with fuel management and the engine blows up on her. Is there any engines that are fairly described as bulletproof? I’m not sure what years or engines to look for as I begin my search. Any help would be appreciated.

CamGTP · January 19

Might be hard to find one of these trucks still depending on where you live but they are still out there.

My opinion is the 2000-2002 Silverado or GMC Sierra with the 4.8 or 5.3 engine. They are the most basic trucks out there. Super simple engines, cable driven throttle body, no fancy electronics, no fuel management systems. Simple tranfer cases and the 4L60e transmissions are good transmissions in all honestly for just a daily driver. Parts are so cheap of them too, everything is basically available from parts stores, dealerships and junkyards if you needed to go that route.

The later 2003-2007's are good trucks as well, they just have more electronics and little issues. But honestly still perfectly good trucks. Just have to watch out for rocker rust, wheel well rust and rusty brake lines if you live in the salt belt for any of the 99-07 trucks.

newdude · January 21

If you are talking the 2019-2026 trucks, the 2.7 Turbomax and if you can find a 5.3 during COVID that was a chip shortage truck. Option code YK9 which was Dynamic Fuel Management delete. They have a $50 credit on the window sticker. Actually, the dealer near me in NY has a really nice LTZ on the lot with 48,000mi that is a YK9 DFM deleted truck. 2021 Chevrolet Silverado 1500 LTZ Williamson NY | Cavallaro-Neubauer Chevrolet 3GCUYGED6MG474597

I had a Turbomax. 2022 refresh. That thing towed fantastic. High payload too since the engine keeps the weight down. Plenty of balls as well.

Avoid the 6.2.

The 3.0 Duramax. Hit and miss. Emissions equipment and sensors are always a potential problem. The MPG they get is amazing but the headaches almost make it not worth it. The 2023-2026 LZ0 variant, we've done a few turbos. 2025-2026 they have a thrust bearing issue going on.

8 and 10 speed. The 8, believe it or not, has been a bit more reliable than the 10. They both have their issues but we've had more 10 speeds opened for valve bodies than 8 speeds. The 10 does drive really nice though, although my 8 speed with the Turbomax was fine and never gave me any issues.

Edited January 21 by newdude

GN2018 · January 22

I should probably post in a different area but I was thinking about any year. It’s sad that the first response referenced trucks over 15 years old. I certainly hope some of the newer engines last well over 100k miles and even over 200k should be no problem with a maintained vehicle.

As for the current models that newdude mentioned, that brings me back to a question I asked before but did not get a very good response. Is it the act of manatee cylinders (DFM) or is it inherent in the components they used? Will shutting off DFM “fix” the problem or, given the components are designed differently for DFM, are they just destined to fail even if disabled?

Reason I ask is because most new trucks were sold with DFM. So, are they all crap? Because if I can shut it off and have a good chance at getting another 100k+ out of my 5.3 v8 Denali, maybe I should just give that truck to my daughter. I currently have 45k miles on mine and I follow the severe duty maintenance schedule but I have not turned off DFM due to it still being under warranty (extended).

Coastie05 · January 22

If you’re looking for a new truck buy the 2.7t. It’s the most reliable engine selection for the 1500 as of now. Depending on trim it can tow 9,500 lbs. My ‘25 Custom 4x4 standard bed is rated for 9,000 lbs. I highly recommend this drivetrain.

Coastie05 · January 22

44 minutes ago, GN2018 said:

I should probably post in a different area but I was thinking about any year. It’s sad that the first response referenced trucks over 15 years old. I certainly hope some of the newer engines last well over 100k miles and even over 200k should be no problem with a maintained vehicle.

As for the current models that newdude mentioned, that brings me back to a question I asked before but did not get a very good response. Is it the act of manatee cylinders (DFM) or is it inherent in the components they used? Will shutting off DFM “fix” the problem or, given the components are designed differently for DFM, are they just destined to fail even if disabled?

Reason I ask is because most new trucks were sold with DFM. So, are they all crap? Because if I can shut it off and have a good chance at getting another 100k+ out of my 5.3 v8 Denali, maybe I should just give that truck to my daughter. I currently have 45k miles on mine and I follow the severe duty maintenance schedule but I have not turned off DFM due to it still being under warranty (extended).

Shutting off DFM will not fix the problem. The issue is the lifters, so unless you go into the engine and do a delete, you won’t be fixing anything.

GN2018 · January 22

1 hour ago, Coastie05 said:

Shutting off DFM will not fix the problem. The issue is the lifters, so unless you go into the engine and do a delete, you won’t be fixing anything.

That’s what I thought. Thanks.

newdude · January 22

13 hours ago, GN2018 said:

I should probably post in a different area but I was thinking about any year. It’s sad that the first response referenced trucks over 15 years old. I certainly hope some of the newer engines last well over 100k miles and even over 200k should be no problem with a maintained vehicle.

As for the current models that newdude mentioned, that brings me back to a question I asked before but did not get a very good response. Is it the act of manatee cylinders (DFM) or is it inherent in the components they used? Will shutting off DFM “fix” the problem or, given the components are designed differently for DFM, are they just destined to fail even if disabled?

Reason I ask is because most new trucks were sold with DFM. So, are they all crap? Because if I can shut it off and have a good chance at getting another 100k+ out of my 5.3 v8 Denali, maybe I should just give that truck to my daughter. I currently have 45k miles on mine and I follow the severe duty maintenance schedule but I have not turned off DFM due to it still being under warranty (extended).

Are they all crap? No. Was there a window of bad lifters during production? Yes. 2020-2021 had like 6-8 months of issues with lifters which required testing and possible replacement right off the carrier.

A truck that is turned off either factory YK9 or with a Range Pulsar has a significantly lower rate of lifer failure. Its not a 100% elimination, but not far off. A full mechanically deleted truck has the best chances.

12 hours ago, Coastie05 said:

Shutting off DFM will not fix the problem. The issue is the lifters, so unless you go into the engine and do a delete, you won’t be fixing anything.

Sure, but it significantly reduces the odds of failure. The amount of trucks with AFM/DFM off that fail is much less than trucks with it still functioning.

GN2018 · January 22

I just bought a Range AFM/DFM eliminator. At least I won’t have to press the disable button every time I start the truck.

diyer2 · January 22

You know me clean oil is better oil, change it more. Can't hurt. My 2012 5.3 motor is quieter at idle than some friends motors. It's had a Range on it for a long time.

GN2018 · January 22

11 minutes ago, diyer2 said:

You know me clean oil is better oil, change it more. Can't hurt. My 2012 5.3 motor is quieter at idle than some friends motors. It's had a Range on it for a long time.

I definitely change my oil frequently. I never go more than 5K miles. I buy a package of three oil changes for $200 but the package has to be used in two years. Given how few miles I drive, it’s more frequent than my standard of 5K per oil change but it’s close so it ends up being a good deal.

KARNUT · January 22

There are some cylinder deactivation engines that last. I guess it’s a combination of a good lifter run and oil changes. My brother in law bought a CPO 2013 Tahoe with 25K miles on it. That supposed to be the worst year for cylinder deactivation. When he was looking I warned him about that year. Here we are many years later it has 175K miles on it with no issues. He’s about to trade his older Tahoe in with close to 300K miles on it and keep the 13 for his vehicle. A practice they’d done throughout their marriage. He’ll probably keep the 13 at least 10 more years now retired. Living in Oklahoma he’s going AWD because of the winters there. He does 5K oil changes.

Edited January 22 by KARNUT

newdude · January 22

59 minutes ago, diyer2 said:

You know me clean oil is better oil, change it more. Can't hurt. My 2012 5.3 motor is quieter at idle than some friends motors. It's had a Range on it for a long time.

44 minutes ago, GN2018 said:

I definitely change my oil frequently. I never go more than 5K miles. I buy a package of three oil changes for $200 but the package has to be used in two years. Given how few miles I drive, it’s more frequent than my standard of 5K per oil change but it’s close so it ends up being a good deal.

Yes, oil change intervals are key.

Grumpy Bear · January 22

7 hours ago, newdude said:

A truck that is turned off either factory YK9 or with a Range Pulsar has a significantly lower rate of lifer failure. Its not a 100% elimination, but not far off. A full mechanically deleted truck has the best chances.

Is the possible with Pepper?

newdude · January 22

12 minutes ago, Grumpy Bear said:

Is the possible with Pepper?

No, that was a COVID chip shortage thing on T1 trucks. A bunch of 5.3s were built with DFM inoperative but the hardware still in the engine. Had a $50 credit on the window sticker.

That said...

Check out Scoggin Dickey's performance parts page or BTR as they make DOD deletes and hot cams for the LV1/3 engines under the "LVX" name.

BTR GEN V LVX V6 DOD DELETE KIT

https://sdparts.com/i-24504716-lv3-dod-afm-delete-kit-for-2014-4-3l-v6-engines.html?srsltid=AfmBOooCSEC_WQ_DSZmAKsdJQZDmL-C5eZt0AlCu9iiA-ARYbt1Ux6sd

sdparts.com/search.html?q=lvx&orientation=vertical

SDPC SDR15976 - "Stage 1" Camshaft for 4.3L V6 LV3 Engines

Edited January 22 by newdude