Amazon.com has for its Prime Members: 1-Gallon Shell Rotella T6 5W-40 Full Synthetic Diesel Motor Oil for $19.57 - 15% subscribe & save - $5 Rebate = $11.63. Shipping is free. http://slickdeals.net/f/8042317-rot...-4-1-gallon-16-63-fs-w-s-s-amazon-5-mir-11-63
