Originally Posted By: 02s4audi
I have an 04 Silverado 1500 with the 5.3 it has 156k miles and has a little blue smoke on start up. My guess is valve seals but I can't replace them right now so I'm looking at trying a different oil. I've tried pp and Castrol edge 5w30 and it's still done it. No noticeable increase or decrease. I was going to try a HM oil due to the mileage on the truck. But was also thinking maybe a thicker oil would help? What would you recommend
I had the same problem with my 05 Silverado in October. The breather on mine is inside of 1 of the valve covers, & was "gunked up." I took it to a good friend's shop & that's what he told me. He cleaned it, & told me to drive it for a week or so & let him know if that remedied it. He said there is also a valve cover replacement for the 5.3 to fix this problem, but mine was not 1 that it was listed for. If mine does it again, I'm going to change the valve cover. He also said my valves were cleaner than he was expecting, & I should keep doing what I am doing with oil changes.