How reliable is the 6.6 gasser?

64BAwagon · October 26

Speaking of the L8S

The rumor is that the EGR and new tuning will have a net loss of 60HP. Thanks California

Edited October 30 by 64BAwagon

C/K Man · November 1

Could be worse. Wait 'til you see what happens to the diesels.....

Art Baker · November 8

2024 2500 HD 6.6 gas

this engine has burned 1 quart every 1000 miles starting at 5000

had It back to dealer 6 times and they have not done a thing

have 35,000 miles now and the oil usage is now slightly more than 1 quart per 1000 miles

lineman1234 · November 12

Might want to go to another dealer and try different oil types, just for the heck of it.

over 20,000 miles on my 2024 6.6.gasser and no notable oil use towing or empty per oil changes.

64BAwagon · November 12

@lineman1234 is on the target. Try switching brands of oil and maybe go to a 10W30 depending on your usage. I know it sounds crazy but my niece had a 2.2 Ecotec that had similar consumption a while back and I told my brother to switch from M1 to Pennzoil Platinum and it dropped a lot.

I only have 6k miles on mine (my 2021 with the same engine used zero oil) but I am likely going to switch to a blend of half 5w30 and half 10W30 due to the amount of heavy towing I do, plus my truck is rarely driven in the winter AND its garaged year round. I am more concerned about it shearing down out of grade than I am cold start.

Edited November 12 by 64BAwagon

bruceb58 · November 12

When warm, there is little viscosity difference between a 5W30 and a 10W30. It's not much! Depends on the brand of oil. Penzoil Ultra is identical at 100°C. Mobil 1 is around 4% difference and Mobil 1 EP the 5W30 actually has more viscosity at 100°C.

Edited November 12 by bruceb58