GP PETROGEN FULLY SYNTHETIC 0W16 API SP is fully synthetic engine oil is tailored for smoother acceleration and provides outstanding engine wear protection even under the most demanding driving conditions To meet the demands of today’s most advanced vehicles – including downsized turbo enginesprone to damage caused by LSPI – GP Petrogen fully Synthetic products have already been tested and approved to both API SP and ILSAC GF-6B specifications.