Yeah the cooler gasket is really easy, the stud on the engine block that you screw your oil filter onto is actually a BOLT with a hole in the middle. It's clamping down the oil cooler sandwich adapter and there's an o-ring on the back of it. Torque spec for the HR engine is 25 ft/lbs, AWD uses a slightly different configuration and torque is 36 ft/lbs.

You can leave the coolant hoses attached to it, remove the oil filter, remove the stud ,it's a large allen hex for the RWD HR, it's actually got a bolt head for the AWD HR and older DE engines, not sure what size but you can probably have your local Nissan pull part number 15213-31U00 for a RWD car or I think 21313-43U0A for the AWD (I think the AWD used the old DE engine bolt) which should be the correct one, then you can size it. Then just pull the sandwich adapter forward enough to get the o-ring out, reinstall the new one, torque to spec, oil filter, done.

Have your local Nissan pull the part number for your oil filter stud based on your VIN number though just to verify the part number.

 

Hi all. Just giving an update. I fixed the sun roof drain leak on top of the head liner and replaced the leaking oil seal. The first seal from a nearby shop (Fel-Pro brand) was the wrong size but the Infiniti dealer had the correct one.
The BCM has been back-ordered for a month now. I can still get into the trunk, I just have to use a long stiff wire to hook the emergency release.

 

You could take a picture of the tag on your BCM and just order a used on from eBay. Make sure it's the exact same part number (it's in the upper left corner of the sticker, it will look like two separate alphanumeric numbers on top of each other), sellers will almost always have a legible picture of that part number tag.

Then you can just swap them in the parking lot of your local Nissan / Infiniti and have them do the programming / pairing (including all your keys) right there in the parking lot.

Just coordinate it with the service manager, it's normally not an issue. Be sure to bring ALL your keys / fobs, they all need to be present during the pairing process.

Used BCM is usually around $200, plus another $150 for a 1 hour service at Nissan.

EDIT: The second half of the BCM part number should start with JK