LS1 Sump gasket leak

[VL Executive]

Hi Everyone

My LS1 Calais is leaking a bit of oil from the LH rear corner of the sump. Leaks when engine is running. Guessing is going to be a new sump gasket. Noticing the flange underneath the leak area. Is their an oil pressure gallery in that spot

https://i.postimg.cc/HLrwdMTQ/Ls1-oil.jpg

https://i.postimg.cc/fyNmcgmK/Ls1-oil-1.jpg

[R8HSVHRT]

Go over all the bolts and and see if there loose , Be carefull not to over titen them just nip them up

[Micks]

Those bungs above you mention should be checked, cheap & easy to replace too.

[WL Caprice]

My 2004 WL Caprice 5.7 has the same oil leak.

Several mechanics have told me it's the rear main.
But when I clean all the oil away with degreaser and then check it after a few days driving I start to see drops of oil forming on the left last and the 2nd last rear sump bolts , and maybe a bit of oil above near where the gasket is.

The sump bolts appear to be tight, but I guess it could be the sump gasket ?
Does the engine have to be removed to replace the sump gasket ?

Where are these blanking plugs you mentioned ?
Can they just be screwed out and sealed with thread sealer and screwed back in ?

[Micks]

My 2004 WL Caprice 5.7 has the same oil leak.

Several mechanics have told me it's the rear main.
But when I clean all the oil away with degreaser and then check it after a few days driving I start to see drops of oil forming on the left last and the 2nd last rear sump bolts , and maybe a bit of oil above near where the gasket is.

The sump bolts appear to be tight, but I guess it could be the sump gasket ?
Does the engine have to be removed to replace the sump gasket ?

Where are these blanking plugs you mentioned ?
Can they just be screwed out and sealed with thread sealer and screwed back in ?

In the first pic the Op posted.

https://i.postimg.cc/HLrwdMTQ/Ls1-oil.jpg

If you have a rear main leak it will be evident towards rear of engine bellhousing adjacent the transmission.