Audi recommends 0W 40 meeting 511-00 specs. I don't have a clue what options are even widely available but I do know that for the price of this bad boy I need to make sure I use the right oil. I am not concerned about gas mileage (there is no hope) but I do want to protect this engine. I drive primarily 5-10 mile trips and 2 or 3 20 mile trips each week. I am wide open to suggestions.