I can only go on what the chap that makes them says I should use :confused:. I am well aware of the risk from oil which my Girl seems to produce in copius ammounts :diablo: They use them in tanks so i guess they are safe.
I have a member of the team who is dedicated to the guns and stays clean at all times. They are a cracking design and fit inside the cannon cowlings with quick relaese fittings at the ports and wing roots. There are as loud as hell, thought the engine would drown them out no fear of that, not sure how many shows will let us fire them 😮