Purchased a 2007 Yukon XL, now to make it reliable!

[OR VietVet]

You are correct! It looks like it’s coming from the oil cooler block off. I’m going to replace the gasket and go from there.

IMO, I would not reuse the plate because it is likely warped and will leak again. Buy a Billet plate and a new o-ring seal and call it good. Clean the old oil off the whole area and then keep an eye on it for future leaks.

 

[YukonGold12]

I also do not hear anything at the 10sec mark but it does sounds like you have a exhaust leak, possibly down at the y pipe somewhere. maybe it's just the video
this is compared to what mne sounds like

Yours sounds great!!

 

[YukonGold12]

Changed the block off gasket. Drove 180 miles. No more leaks from that section anymore. Now some oil accumulating at the base of the pan and at the top around those bolts. Going to need to track those down, there isn’t oil under the car anymore after it sits for some time. Which seems to be resolved from that gasket replacement.

It looks like there is something accumulating around the diff. I had cleaned that area last night when I changed the oil.

 

[YukonGold12]

Worked on the truck again today.
- Changed spark plugs and spark plug wires
- MAF sensor cleaned
- Air filter replaced

That #8 plug was kind of a pain, but I decided early on I was going to attack it from the wheel well, removing the liner and everything made that easy.

Old plugs were toast. I've attached some pictures of the plugs and I scoped the cylinders for y'alls enjoyment.

The engine seems to be idling much better, although still some work to be done.

 

[YukonGold12]

The rest of the cylinders.

 

[YukonGold12]

Spark plugs 1,3,5,7

 

[YukonGold12]

Spark plugs 2,4,6,8

 

[OR VietVet]

1, 7 and 4 look to have some deposits and likely oil burn on them. Needs a set of plugs, at least.

 

[donjetman]

x2 what OR VietVet said

and make certain it has the update driverside valve cover GM# 12570427 to minimize oil consumption thru its built in PVC system.
Original top (poor design) and updated bottom.

 

[donjetman]

And check the GM service bulletin out:
https://f01.justanswer.com/ebrock63...il+Consumption,+MIL+ON,+Engine+Runs+Rough.pdf