^^^^ you spend £20k on a prize possesion, im sure not only you will keep it clean and looking great, but same goes for the most expensive peice of it under the bonnet!!!. Look after it, the cars no good as an ornament with a blown engine!.
Follow the owners Handbook. Its for a reason. You choice if you wish to risk it, and go on people that havent followed the owners handbook at your own risk. Too much to risk in my oppinion for no gain what so ever!.