Got a 99 z71 with the 5.3 recently started leaking oil from what I thought was the rear main but it's not pulled the flywheel inspection cap and all down inside there is dry. The drivers side valve cover is pretty nasty but I don't think it's leaking any other ideas? Seems to be coming from drivers side

 

Oil pressure sending unit.

Happened to my brother's '00 4.8 and his '03 6.0.

 

Thanks For the info I'll have to check that!

 

get some brake cleaner or purple power and clean egine, turn the truck up an look for the leak best way to do it ,then just guessing

 

i went through this checked all the above listed things. turned out my valley cover bolts under the intake manifold lossened up and was coating the valve cover as well as a ton of other stuff. im not saying thats the problem but give them a check. i replaced the valve cover gasket the olipan gasket and the sensor on the back of the block before i found it. hope this helps

 

Whoa I didn't even know that was possible thanks for the info

 

Interesting info mattjones. I'll be checking that next on my brother's truck, since it still has a minor leak.