The reason this seems crazy to me is that a fixed appointment time is way harder for me to meet (even though I keep a calendar). I'd rather just schedule my ow

The reason this seems crazy to me is that a fixed appointment time is way harder for me to meet (even though I keep a calendar). I'd rather just schedule my own time. If I could give the service a key to the car (and trust them to figure out when I needed service), it might be worth doing, but I am not a dedicated car commuter.