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Old March 20, 2013, 09:44 PM   #6
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Join Date: December 20, 2008
Location: Somewhere on the Southern shore of Lake Travis, TX
Posts: 2,447
DOT 5 brake fluid is silicone based and is not compatible with DOT 3 or DOT 4 brake fluids which are based on polyethylene glycol.

Maybe DOT 5 brake fluid works but if in doubt, I would stick to the stuff Beeman sells, it's not like you need to use a whole lot of it.
I'm sure that silicone oil is used based on its non flamible nature. Regular oils tend to "diesel" or compression ignite inside the compression chambers of high power air rifles.
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