I make the annual service reservation well ahead of time - that helps. Frankly I was surprised to get a Model S when my car failed the day after I got it back. We were into the holiday season so maybe they didn't have as much on schedule. LOL the current loaner also has some intermittent issues, apparently started when I got the car. I'm cursed! Tesla says they think it has a bad ground. Parking sensors randomly fail, the frunk latch alarm goes off for no reason and goes away a fraction of a second later. Occasionally the theft alarm goes off spontaneously. Tesla offered to take it back and give me an Enterprise, but the problems are mostly just amusing, and you never know what you're going to get with a rental. I had a kinda terrifying adventure with one a couple of years ago. Ford Fiasco... uh Fiesta.... with worn summer tires in the worst snowstorm of the season!