[Hazel W]

hi gary
if u decide to use mineral oil then you can no longer consider your cyls o2 clean.
I know many people use mineral oil but it is a fact that as your filters load up with hydrocarbons some will start to pass through into the mix.
This is especially a problem where 100% o2 is in the cyls at the start of a PPo2 mixing process...not only are hydrocarbons bad for you but they can act as a combustable material in the presence of high pressure o2....its generally a bad idea.
the non mineral based compressor oils or the synthetic variety are better ( and not as bad for you)

the decision is urs of course but i would strongly recomend following manufacturers recomendations if you are supplying the mixex to anyone other than yourself ......we live in the litigative society after all!


Hazel