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We use Mineral oil because it is cheap. The Alternative is Silicone oil.
Mineral oil will turn golden or cloud if water intrudes therefore, if you are using it in something like a gauge that needs to stay clear for many many years use the silicone. If you are using it inside a reg, use the mineral oil and replace it at every service.
Learn something every day. What kinds of regs use a mineral oil that doesn't leak, and is legal to use in the ocean if it does leak?
and is legal to use in the ocean if it does leak?
is legal to use in the ocean if it does leak?