Home Slickdeals Amazon Prime Members: Castrol GTX MAGNATEC Full Synthetic Motor Oil (5 Quart)... Slickdeals Amazon Prime Members: Castrol GTX MAGNATEC Full Synthetic Motor Oil (5 Quart) ~ 5W-30 for $15.20 w/ S&S, 0W-20 for $16.90 w/ S&S @ Amazon.com By ARCOM - 18 January 2018 183 0 SHARE Facebook Twitter Go to the deal page: Amazon Prime Members: Castrol GTX MAGNATEC Full Synthetic Motor Oil (5 Quart) ~ 5W-30 for $15.20 w/ S&S, 0W-20 for $16.90 w/ S&S @ Amazon.com