Hi group! I found this site a few months ago in my search for the "perfect" oil and oil filter combination.
I took my 07 Silverado truck into the dealer with 72k miles because I had a knocking noise coming from the engine.
After they took the engine apart, they ended up replacing the lifters and push rods. They also told me that I had an excessive amount of sludge buildup. My trucks first oil change was with Amsoil 5w30 and has been since. I don't pay too much attention to what dealer mechanics say, only because I don't believe them most of the time.
I have been reading about the GM piston slap problem and I even questioned them about it, but they didn't think that was the case here. That though seems to be a stock answer that GM tells them to say to everyone with this problem though.
Thankfully, all this work was covered under warranty too. I was asked about oil changes and I told them that I changed it when the "change oil" light comes on. That satisfied them (I lied) and they told me to go back to petroleum based oil and start changing every 3k miles now.
They said most trucks that run on synthetics have the most engine problems that they see. Again, I don't believe in too much of what they say, but it has got me thinking though.
What do you guys think?
I do mostly freeway travel. 34 miles one way to work and of that, 5 miles are on streets, 29 miles are on the freeway and I typically travel 70-80 mph.
I took my 07 Silverado truck into the dealer with 72k miles because I had a knocking noise coming from the engine.
After they took the engine apart, they ended up replacing the lifters and push rods. They also told me that I had an excessive amount of sludge buildup. My trucks first oil change was with Amsoil 5w30 and has been since. I don't pay too much attention to what dealer mechanics say, only because I don't believe them most of the time.
I have been reading about the GM piston slap problem and I even questioned them about it, but they didn't think that was the case here. That though seems to be a stock answer that GM tells them to say to everyone with this problem though.
Thankfully, all this work was covered under warranty too. I was asked about oil changes and I told them that I changed it when the "change oil" light comes on. That satisfied them (I lied) and they told me to go back to petroleum based oil and start changing every 3k miles now.
They said most trucks that run on synthetics have the most engine problems that they see. Again, I don't believe in too much of what they say, but it has got me thinking though.
What do you guys think?
I do mostly freeway travel. 34 miles one way to work and of that, 5 miles are on streets, 29 miles are on the freeway and I typically travel 70-80 mph.
