2019 Sierra AT4 5.3 engine failure

[Dabco]

I was driving on freeway at about 70 when I engine lost power and started making a lot of noise. I brought it in and found that engine was shot at 118,000 miles.

I had every oil change done by GMC and at about 85,000 miles I noticed it started losing oil. every 5000 miles I would be down 2 full quarts. I had 2 oil consumption tests at 2 different dealers, and both said it was within the tolerance for oil consumption. I had an GM extended warranty till 110,000 miles but they still wouldn't do anything for me. Now I had to get a new crate engine. You would think GM would stand behind their product, but I guess not.

[diyer2]

How often did you change the oil? Over 5k miles? 

Every 5k miles down 2 quarts, you let it get that low?

 

Pluged up oil rings?

[Silverado4x4]

Do you expect GM to stand behind their product for the life of the vehicle? Get it fixed and move on. Your first post and this is what you post.

Edited April 17 by Silverado4x4

[newdude]

1 hour ago, Dabco said:

I was driving on freeway at about 70 when I engine lost power and started making a lot of noise. I brought it in and found that engine was shot at 118,000 miles.

I had every oil change done by GMC and at about 85,000 miles I noticed it started losing oil. every 5000 miles I would be down 2 full quarts. I had 2 oil consumption tests at 2 different dealers, and both said it was within the tolerance for oil consumption. I had an GM extended warranty till 110,000 miles but they still wouldn't do anything for me. Now I had to get a new crate engine. You would think GM would stand behind their product, but I guess not.

 

 

You went 5000mi on 2 quarts low?  Possibly repeatedly it seems?  And then are mad at GM for your neglect of maintaining proper oil level?

 

GM max allowable consumption is 1 quart in 2000mi.  You are below that threshold and would be considered normal.  Oil level should be checked at every fuel fill up.

 

There are also products out there that you could have tried to reduce oil consumption like Valvoline Restore and Protect which would have likely eliminated or close to eliminated your consumption issue.  

Edited April 17 by newdude

[silveradosid]

i thought it would be snake oil, but i have to admit valvoline restore and protect does work. my 2.7 would use 1.5 quarts in 4500 miles and i would change the oil. my last 2 oil changes i used valvoline and it has reduced my consumption by half a quart already