Ah man, I've stopped swearing long enough to ask this question: I just bought a bottle of this stuff: http://www.nulon.com.au/products/Performance_Engine_Treatment/ And without thinking I started to pour it in the petrol tank of my GS500!! Not a lot went in and the tank is full but that may not matter. What's the damage? I don't have the means or area at my current location to do drain the tank or do anything myself. Please advise!