So I did the natural thing, and promptly worked on the garage first.
This is after I cleaned the floor. Degreased the oil spots. Then Citric acid washed/etched the concrete. To my surprise the oil disappeared. And so did the tire marks.
And that was so that I could lay down an Epoxy Floor! I have always wanted to do this. I wonder how glossy it will actually be. It does say high gloss... There are the standard white/blue/black specs. I did run into 1 snafu...
So I cleaned up, and then tested the garage door... oh crap, if you hit the button on the way down it just goes back up. But if you hit it again it stops... But the delay is massive... and this is important because I cant close the garage door on the wet epoxy floor. But then I realized that earlier I had found a 4ft piece of 1/8th round steel. So I bent the end into a U. Paused the door about 2 feet from the ground. Reached under and managed to pull the Emergency handle. Yay. Found a cap in the my car about an inch tall, placed it next to the door track, and manually let the door down on it. 1/2" gap across the bottom! success!
I think tomorrow I am going to prime the walls of the garage. Raw Drywall no bueno. Probably will paint it too.