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Re: Brass Instrument Oil if storing long-term?
Used to work for a guy who swore by his “deep storage” method. He’d oil the valves with 3 in 1 oil and grease the sides with Walmart red lithium grease. It was thick stuff, but he swore that he never had to pull a frozen slide or valve his whole career. He’s use it on the marching and concert piston-valve brass every season change. The 3 in 1 didn’t work so good on rotor valves, though.