Serious oil leak 07 5.3

[MrsAlderman22]

Okay gentleman I have a 2007 GMC Sierra 1500 with the 5.3 vortec it has a serious oil leak looks to be coming from the passenger rear side I already changed the valve cover gasket it's not that I checked the crankshaft sensor not that it only seems to leak when it's driving it doesn't seem to really leak out a lot when it's just idling any ideas I've heard about the oil pressure sensor when I fell back there that seemed more dry than it would be if it was that. Also tried uv dye and like I said it leaks while driving so when i stoped to look with light oil is everywhere. Will add pics later today. 

Edited November 20, 2023 by MrsAlderman22

[Black02Silverado]

More than likely it is the rear main.  You have covered all the other places that it could be for the most part. 

[Niklasbraun]

On 11/20/2023 at 1:55 PM, MrsAlderman22 said:

Okay gentleman I have a 2007 GMC Sierra 1500 with the 5.3 vortec it has a serious oil leak looks to be coming from the passenger rear side I already changed the valve cover gasket it's not that I checked the crankshaft sensor not that it only seems to leak when it's driving it doesn't seem to really leak out a lot when it's just idling any ideas I've heard about the oil pressure sensor when I fell back there that seemed more dry than it would be if it was that. Also tried uv dye and like I said it leaks while driving so when i stoped to look with light oil is everywhere. Will add pics later today. 

It looks like there might be a leak while you're driving. Ever thought about checking the rear main seal? It's often the cause of leaks on the passenger rear side.

And your gut feeling about the oil pressure sensor could be onto something. Even if it seemed dry, maybe give it a close look or even swap it out to be sure.