So if you're saying that water rots rubber then why is rubber THE most commonly used material for making seals etc? I wasn't asking anyone to be a clever fanny, I was asking for a straight answer. It's f**k all to do with being pikey either, water is a shitload faster than oil due to the viscosity. So anyone with an ounce of brain like to offer an explaination as to why water rots maggy internals?