Home Slickdeals Castrol synthetic motor oil 0w-20 for $16.38 Amazon subscription deal. Slickdeals Castrol synthetic motor oil 0w-20 for $16.38 Amazon subscription deal. By ARCOM - 10 January 2020 124 0 SHARE Facebook Twitter Go to the deal page: Castrol synthetic motor oil 0w-20 for $16.38 Amazon subscription deal.