Does this look like an oil cooler gasket leak?

[NoReverseYukon]

What I though was a rear main seal leak might be something easier to fix. Giving it a closer look, this is what I saw :
The arrow points to the gasket ( obviously ) , and the circle is the oil trace. Having oil running down and dripping off the filter also leads me to believe that the gasket is leaking, plus all the dirt/etc. in the general area.
My engine code is "T" - LM7 and when I look up what gasket I need , I am given 2 options: One large oval -
or two small ovals -

Advance Auto says both are exact fits. Before I start this repair, does anyone know which one I should buy ?

Thanks

 

[OR VietVet]

I believe it is the gasket as per the pic. To know for sure, clean and dry thoroughly and idle/drive engine and recheck. Buy both gaskets and return the one you don't use. IMO, the two port seems correct.

 

[Fless]

It looks to me like you have the blockoff plate, so the large oval would be the correct one. If you have oil cooler lines (it doesn't look like you do) the gasket with two holes is for trucks that have those.

 

[OR VietVet]

It looks to me like you have the blockoff plate, so the large oval would be the correct one. If you have oil cooler lines (it doesn't look like you do) the gasket with two holes is for trucks that have those.

LOL...he said oil cooler and I just went with it but I agree with you....two ports for actual oil cooler lines and one port for the block off plate. My 02 had the block off and I used the one port gasket and my 05 has the cooler lines and uses the 2 port gasket.

 

[Fless]

Check the area around the oil pressure sender and the cam position sensor on the top rear of the engine block, too. Those, as well as the rocker arm covers, are prone to leak and that oil runs down the block.

 

[NoReverseYukon]

Thank you both. No, my Yukon doesn't have an engine oil cooler. Odd, since it does have the tranny cooler and towing package. Anyways, at least now I know which gasket I need. I'll see if this stops the leak before I move on to the pressure sensor &/or cam sensor.

 

[OR VietVet]

Those block off plates warp over time so when I did mine I had ordered a billet plate to replace it.

Amazon.com: Z Whip LS Billet Oil Port Plate On Oil Pan for Gen III IV Series Engines LS1 LSX LS2 LS3 Oil Port LQ4 LQ9 LS6 L92 L99 L33 5.3L 4.8L 5.7L 6.0L 6.2L Proudly Made In The USA : Automotive

Buy Z Whip LS Billet Oil Port Plate On Oil Pan for Gen III IV Series Engines LS1 LSX LS2 LS3 Oil Port LQ4 LQ9 LS6 L92 L99 L33 5.3L 4.8L 5.7L 6.0L 6.2L Proudly Made In The USA: Pick-Up Tubes & Screens - Amazon.com ✓ FREE DELIVERY possible on eligible purchases

www.amazon.com

 

[NoReverseYukon]

Those block off plates warp over time so when I did mine I had ordered a billet plate to replace it.

Amazon.com: Z Whip LS Billet Oil Port Plate On Oil Pan for Gen III IV Series Engines LS1 LSX LS2 LS3 Oil Port LQ4 LQ9 LS6 L92 L99 L33 5.3L 4.8L 5.7L 6.0L 6.2L Proudly Made In The USA : Automotive

Buy Z Whip LS Billet Oil Port Plate On Oil Pan for Gen III IV Series Engines LS1 LSX LS2 LS3 Oil Port LQ4 LQ9 LS6 L92 L99 L33 5.3L 4.8L 5.7L 6.0L 6.2L Proudly Made In The USA: Pick-Up Tubes & Screens - Amazon.com ✓ FREE DELIVERY possible on eligible purchases

www.amazon.com

Does this plate's o-ring take the place of the original gasket?

 

[ScottyBoy]

Those block off plates warp over time so when I did mine I had ordered a billet plate to replace it.

Amazon.com: Z Whip LS Billet Oil Port Plate On Oil Pan for Gen III IV Series Engines LS1 LSX LS2 LS3 Oil Port LQ4 LQ9 LS6 L92 L99 L33 5.3L 4.8L 5.7L 6.0L 6.2L Proudly Made In The USA : Automotive

Buy Z Whip LS Billet Oil Port Plate On Oil Pan for Gen III IV Series Engines LS1 LSX LS2 LS3 Oil Port LQ4 LQ9 LS6 L92 L99 L33 5.3L 4.8L 5.7L 6.0L 6.2L Proudly Made In The USA: Pick-Up Tubes & Screens - Amazon.com ✓ FREE DELIVERY possible on eligible purchases

www.amazon.com

I didn't know they can warp, perhaps that's why mine was still leaking even after I replaced that gasket. I ended up using Ultra Gray RTV Gasket Maker on it, and it's been leak free ever since. I think that was over 2-3 years ago. I do however, have leaks elsewhere. It looks like the valley cover under the intake is leaking.

 

[ScottyBoy]

Does this plate's o-ring take the place of the original gasket?

Looks like according to the seller, you just use the O-ring.