A AC1DD Joined May 2, 2019 Messages 1,147 Location USA Jan 29, 2020 #21 Those Mustangs used GL-3 fluid and would now use GL-4 since GL-3 is obsolete. HOWEVER GL-5 DOES NOT REPLACE OR SUPERCEDE GL-4! BOTH ARE DESIGNED FOR DIFFERENT APPLICATIONS!!!! Last edited: Jan 29, 2020
Those Mustangs used GL-3 fluid and would now use GL-4 since GL-3 is obsolete. HOWEVER GL-5 DOES NOT REPLACE OR SUPERCEDE GL-4! BOTH ARE DESIGNED FOR DIFFERENT APPLICATIONS!!!!
