Home Slickdeals Castrol GTX MAGNATEC 5W-30 Full Synthetic Motor Oil, 5 QT $18.94 +... Slickdeals Castrol GTX MAGNATEC 5W-30 Full Synthetic Motor Oil, 5 QT $18.94 + tax + PRIME By ARCOM - 15 June 2019 151 0 SHARE Facebook Twitter Go to the deal page: Castrol GTX MAGNATEC 5W-30 Full Synthetic Motor Oil, 5 QT $18.94 + tax + PRIME