A throwback to the sparklingly clean service stations of old, self-serve Petaluma Unocal sells diesel, ethanol and regular gas to its customers. Open and airy, the big red pumps with the red 76 on them look cheery, inviting customers to wash their windshields, fill their tires, and just buy gas. The snack shop carries the usual variety of goodies: water, soda, beer, wine, snacks, hot dogs and lottery tickets.