What oil change interval have you been using?   What specific oil and oil filter do you use?   Another potential cause for oil loss is the PCV valve.   What Model do you have? - please add your Model and Year to your profile signature - https://www.fordedgeforum.com/settings/signature/

Noticed my oil pressure light would come on randomly at idle. It's not all the time but at least once a day. Noticed oil level was slightly low so I added half a quart to bring it in range. Fixed the issue but 2 weeks later same issue. Looked under car and I can see a very small leak. It appears to be coming from the oil pressure switch or the unit connected to the pulley or maybe both not entirely sure. I plan to change the oil pressure switch tomorrow when I do an oil change since it's 10k miles and due for one. Any thoughts or next steps. No other noticable issues and vehicle drive fine no shaking or noise from engine.   Ordered Motorcraft SW8368 Switch       2013 Ford edge base model. 135k miles. Always run full synthetic with advanced 20k filter. 

No transfer case, the PTU handles these duties in all wheel drive vehicles.

All,   I'm looking to service the rest of my drivetrain on my 2019 Edge ST.   I did service the transmission several months ago so good to go there.   It looks like the PTU needs to be sucked out of the fill and replaced with 12.7oz of 75W-85.   It looks like the RDU has a drain and fill plug and replaced with 28.1oz of W75.   Dumb question: Does this vehicle have a transfer case?  I can't seem to find any details on it if it does.  I have a 2020 Explorer that does have a transfer case that I'm going to swap the fluid on.   Thanks!

They are not all the same! There are some many factors. While diameter is important, what that diameter does, how many revs per mile, is sometimes easier to see the differences. 2 randomly picked tires that tire rack shows the actual specs for (not the generated from published sizes). I don't think you understand section width versus tread width, and how that can affect the ratio (that 60 in this example which is a percentage).  

Thanks for the information. I will check that cable for sure.  For some reason in the back of my mind, I thought about what garycrist had posted. With all the technology around us -RF interference/radio waves/cell towers/Wi-Fi etc. all it would take is being in the right place at the wrong time. When these systems get interfered with, they get confused and go crazy. I feel like the dealer is going to tell me they couldn't find anything and everything is ok. Unless it happens again at which point I am driving it directly back to the dealer without shutting the car off so they can see what I am talking about. I will definitely give an update when I know more. Thanks for all the great info. 

There is an exact dimension specification for each tire size as determined by the tire size calculator and the chart that I referenced. I also understand that there are tolerances to the manufacturing process. The recommended (but not codified) tolerance is +/-3 percent, which as Samurai Edge said, is minimal. Multiple tread depth readings must be taken around the tire to determine wear. However, the correct measurement to use would be at the lowest point. (A tire down to the wear bar at any point is a tire that needs replacing, even though at another point, the wear bar is not showing.)

As far as your slight clink, it may require a software update to remove that clunk.  The dealer should doo this at nob charge as it is an update, not a recall, but if you are having issues then tell them to fix it.   I saw the same notice on the 25L02.  IIRC, the notice states that IF your car is affected, the service is provided at no charge.  Just because you got the notice does not necessarily mean your car is involved

See my post in the Brakes, Chassis forum regarding this issue. 

Will they fit without issue?  Probably.  They are almost an inch wider so you may / may not have rubbing issues based on the OEM wheel design.  However, you don't just pick the 265/45-20 because the ST performance package has 265/45-21s.  That is not how it works.   What you want to do is find the same overall diameter of both size tires, otherwise you can affect speedometer readings and well as other mechanical components of the vehicle, as compared to what the vehicle was originally designed to.   There is not a lot of difference but to me, that is not the way I would go