hello all my friend bought a pair of 04 magura levers from a shop, but not going to tell you the name of the shop because its a bit nasty to the shop owners!!!!!! These levers were faulty because the seals weren't really doing their job they just leaked magura oil all over so he had to bleed his brakes at least twice a week which was just getting boring for him. His dad knows a bit about hydraulics except he knows the wrong hydraulics to these levers so he decided to bleed the maguras with dot oil as it is thicker than the magura mineral oil. The oil does still leak as the lever pulls in more and more every week or so and we know its not the pads because we checked them already. There was a post on here about a week ago about bleeding your brakes with baby oil , and somebody put that you 'shouldn't use dot oil as it has swelling agents in it'. So just a couple of questions about the stuff: What exactly are swelling agents ? Is there a mineral dot oil? and Does baby oil work just as good as magura oil? Thanks for any help as my friend needs a good lecture about bleeding his brakes with the dot oil ben