Mystery Oil Leak

[kbuskill]

My last check was passenger side and seems to be slightly above/around the starter. I thought it was the oil plug...no. I saw a few drops come down when I wiped things clean then started the truck to try to take a look. Geotrash noted the valve gasket but I 'think'...again my opinion... I would smell or see smoke cause that engine gets hot. Again I could be wrong. I literally just came in from outside and its strictly on the passenger side (drips). So I am trying to see what is all on that side that could need a gasket replacement or complete replacement (hoses..etc.). Swear its like I solved one mystery (oil pressure), then another (driver side oil leak), and now this but this just feels like something simple yet complex cause I'm trying to lock in on the source.

The crank position sensor is behind the starter in the side of the block on the Gen IV engines. It could be leaking.

 

[Geotrash]

The crank position sensor is behind the starter in the side of the block on the Gen IV engines. It could be leaking.

+1.

 

[Larry07Yukon]

What is the part number for the gasket on the oil line? I’m leaking right above the filter and wan to fix on the next oil change

07 Yukon XL Denali

 

[Fless]

It's probably the oil cooler line connection, or the blockoff plate. The gaskets are different, depending on if you have the oil cooler lines. How about a pic?

 

[Doubeleive]

block off plate will have a gasket only, if there are external oil cooler lines then it probably has both a gasket and the lines will have o-rings

 

[89Suburban]

The crank position sensor is behind the starter in the side of the block on the Gen IV engines. It could be leaking.

+1.

Why does that leak oil? Is it in an oil galley passage? Or I guess it's poking into the crankcase? Curious now if this is where my leak is.