Well guys, I have an odd one here..My oil cap apparently flew off sometime in the last 500 miles. Just must have come off and relocated itself stuck on the plastic inner fender well.. theres a bit of oil spattered on my plug wires and other parts but no big mess really.

Those who know me personally know I am **** about such things, and double or triple check things like making sure the oil cap is on after a fill or change, so that pretty much rules out that possibility. And nobody else touches my truck so it wasn't anyone else.

Any ideas? Think it could have vibrated off?

-Lurius

 

maybe it is a blowby problem? check you PCV valve, it may have blown out too.

 

No PCV valve on 04 silverados, just a rubber section where one would be, and it is all connected just fine.

-Lurius

 

So if there is no PCV valve, what relieves crankcase pressure?

 

Completely unsure, lol. PCV systems are a mystery to me.

-Lurius

 

Probably the plastic tab that locks into the cap. Replace the filler neck and see what happens. With big engines, blown oil caps and dipsticks aren't that rare

 

No filler cap, I screw it directly into the valve cover.

-Lurius