Good advice there mickey.
After I'd completed all the shaping of the pipe I let it thaw and blasted it out with an air line, then stuck it on the radiator to make sure it was completley dry. (Your absolutly right oil and water DON'T mix )
With regards to the PDF's, that would be awsome I'm an aircraft engineer by trade so know a few people in a few machine shops that can give me a hand if I get stuck
I am very gratefull for your kind assistance.
Best regards
Damo