After the service, I took a look at the fluids in the car. There is a tank marked coolant with F and L marks on it, and the the level of fluid in this tank was (significantly) below the L mark - it looks like there are about two cups total at the very bottom.
This means that you can book a round-trip ticket to Hawaii from anywhere Delta flies in the US, Canada, Mexico, Puerto Rico, or US Virgin Islands using Korean Air miles for only 25,000 miles in coach or 45,000 miles in Business Class.
Delta is changing its program so that starting in 2015, customers will earn miles based on how much they spend, not just miles flown. On Thursday, the airline released charts showing how many miles you'll need to earn a free trip. That's a key piece of information for SkyMiles customers that Delta had planned to hold back until late this year.