Hi Scotty, Would it be possible to change the manual transmission gear oil in Toyota Camry 1994 DX model by using Mobil 1 104361 75W-90 Synthetic Gear Lube ? The manual instruction does not specify conventional or synthetic and they suggest to use GL4/5 standard if GL3 is not available. Mobil 1 104361 75W-90 Synthetic Gear Lube has GL5 standard and it is synthetic. Many thanks :)