Yeah, it's sort of a tough find....I don't know if you have an autozone there, but if so they sell a brand called coastal which is standard dino oil gl-4 rated. If you can't find any, you might have to pay a bit more and get a synthetic gear oil. You should be able to find products from redline, amsoil, royal purple that will be gl-4 rated. Don't just give up and buy the gl-5 rated gear oil, it can potentially be very harmful to your tranny