Car Bus Thumb

If I pour oil into my car, I can watch it pour back out again. Can't see where it's coming out, but it looks like it's either the head gasket or maybe a seal near the timing chain. The bus leaves 10 minutes before I get off work, or an hour after. I think I may just use my thumb today. Haven't done that in a long time, so it might be kind of fun. I have an appointment for the car on Monday. I think I'll rent a car for next week, because I suspect it'll be a while before it gets fixed. If it's the head gasket, I think I'll get a different car.