6kjt5

A problem waiting to happen........not fun

Dealer did the first oil changes with Delco semi and full syn oil. I now use Mobil 1 Here is a recording of the engins from cold start to 2min 30 sec at about 1:30 i reved the engine up to 1200-1500rpm 2022_05_03_12_32_20.mp3

Here is a recording of the engins from cold start to 2min 30 sec at about 1:30 i reved the engine up to 1200-1500rpm 2022_05_03_12_32_20.mp3

I have a 2016 Sierra 1500 with a 6.2 L engine. Until four months ago it was fantastic. Four months a go it suddenly started making the dreaded lifter noise. The noise is louder when first started and then quiets down some, but does not go away after about 30 min of driving. its hase never been lowon oil and i use fill synthetic. I took it to the dealer for some warranty work and pointed out the noise. They said to bring it back in a few weeks to see if there were any misfire codes. I took it to another shop and the mechanic said that he could hear the noise, but could not tell which cylinder. Since there were no misfire codes, he said to keep driving and come back later to check for codes. I stopped by an auto store the other day to use their code reader to see if any error codes had developed.....No codes, no misfire codes, NOTHING. Any recommendations?