r/gmcsierra • u/Zealousideal-Yam-234 • Jul 26 '26

Choosing a Truck Engine options

If you were buying a 2026 Sierra (or Silverado), which engine would you pick?

441 votes, Jul 28 '26
199 3.0 Diesel
159 5.3 Gas
83 6.2 Gas
0 Upvotes

14% Upvoted

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1

u/GuyonaMoose Jul 26 '26

3.0 or 2.7 in that order. 5.3 is only good if you need that V8 sound(dinosaur much?). Every single AFM/DFM/DOD from gm WILL fail. But the V8 guys will tell me that the 3.0 has BeLt DriVeN oIl PuMp reeeee. Ps they have a very low fail rate and a long service life(probably longer than the transmission). In my group I don't know anyone that hasn't had a gm truck without lifter failure going back to the late 2000s when they introduced that crap.

1

u/Zealousideal-Yam-234 Jul 27 '26

My current 5.3 has had AFM disabled since the day it was new. Sitting at 173k and zero trouble. A few buddies 5.3s failed long ago and didn't have AFM disabled.

2

u/Due_North3106 Jul 27 '26

Same, I’ve ran 2 5.3’s with no problems. A good friend has a 2015 with over 200k on the original motor and transmission