I have an 05 LS with the 5.3 V8. There is a pretty bad oil leak that looks like it is coming from the oil filter. I put a new oil filter and oiled the gasket and cleaned the surface for the filter and everything looked good, but still there is a leak. I was thinking it could be the mount or the housing that the filter screws onto it may be cracked. I don't really know what to think. Any thoughts?

 

Another possibility is that the o-ring from the old filter came off the filter and is stuck to the engine, and now there are 2 gaskets there. I ahve seen thgis happen on several occasions.

 

are you using ac delco oil filters? could be a wrong filter or does the 5.3 have a extra capacity filter ?

 

Trace the oil to its highest point of where it appears to be leaking from and start from there.

 

Does your truck have an oil cooler? If so, I think the lines attach to the block just above the filter.