Gulf Western Oil is a brand of Australian engine oil. ABsolute worst quality shit you can put in your car. Even worse then that Coles Smart Buy motor oil. The stuff costs like 10 bucks for 5 litres compared with 80 bucks for mobil 1 but as they say, you get what you pay for.
If some dickhead tries to sell you gulf western you should smack them one in the face because they obviously dont know three fifths of fuck all when it comes to engines or they have a vested interest in an engine reconditioning garage.
Barry: "Man what the fuck are ya puttin that Gulf Western shit in your car for?"