Improve the performance of your boiler with products and services from our heating oil dealers in Philadelphia, Pennsylvania. Cass Oil Company, Inc. has served the Philadelphia, area for more than 50 years and our neighbors are our customers. We're known for our fast service and same-day deliveries. You always receive the best value for your money when you purchase fuel from us. Our main concern is to do everything in our power for families who need heating oil, and give fast, same-day service at a price that offers real value.