I have a CS with 420 miles. Went out this morning and noticed a light green slightly oily puddle under the left rear tire. Believe it's coolant. Checked coolant level and seemed below minimum. Added about 8 ounces of water and was back up to max.

There is a steady drip coming from above the left rear wheel.

Dealer says to bring it in. No problem except the dealer is 75 miles.

Anyone know what might be wrong? Any advice?