You are correct. I've mentioned this a bunch of times, but folk lore continues. While both PG & VG will feel slippery to the touch, it's not the best lubricant, especially VG, which will get STICKY, the opposite of what you want. You put that tank down for a few days or weeks, and wonder why the juice FLOW is stuck, or barely moves.
If you are going to go through all that trouble, and tear down to lube the orings, why not use the products that are meant to LUBE ORINGS?
There are many good products, I trust DOW, they make products for the food industry and have been in business a very long time. While it's no matter to me what folks use, this us what I use:
https://www.amazon.com/gp/product/B00X7JXM4C/ref=oh_aui_detailpage_o08_s00?ie=UTF8&psc=1
Thanks! Looks like I will have to wait till Saturday to get it from Amazon. Will check if Safeway or Homedepot carries something similar on my way to home.
Otherwise makes sense to wait and do it right given the trouble of lubing so many o-rings.