You don’t need GTL to have a Dexos cert. All about saving the Benjamin’sPennzoil Ultra Platinum has lost its "Dexos GM Approval" as Shell was forced to change its formulation process following the Iranian missile strike on Shell's Pearl GTL plant in Ras Laffan, Qatar. Pennzoil Ultra Platinum is now a Hydrocracked Oil, not an ultra-pure GTL Oil.