I don't have much to report with tractors so for lack of anything else here's a el-cheapo setup I just got done building today.
I have several differentials and a couple of transmissions that I want to change gear lube in so the realistic thing to do was just buy a 5 gallon bucket of 80-90. Just in case anyone is buying some, Sam's Club was cheapest at $48 bucks, and that was a lot cheaper than ordering online or Tractor Supply.
Quite a long time ago I dug two old barrel pumps and a couple of those low mechanics chairs with creeper type wheels on them out of a scrap yard. I just traded some of my scrap for their scrap.
Anyway I remembered I had that stuff out in a shed and built one pump out of two, and used combinations of the piping to fit the bucket depth, and the rest of the pipe made the vertical pipe and handle along with a "tee" from my plumbing fitting box. I used a bushing that fit the pipe as a nut with two big washers to mount the handle pipe to the mechanics chair. The clamp system is two barbell weight clamps with a piece of 1" square tubing welded between them. It works great and didn't cost anything but some junk I had laying around.
I am considering buying motor oil for the vehicles in buckets now too to save a few bucks in the long run.