Posted by Ben Arunski on February 25, 2004 at 08:53:34:
In Reply to: Re: Re: Re: Re: first valve slide issues... posted by Oh really? on February 24, 2004 at 20:19:33:
It's true, you can generally get away with mixing natural and synthetic oils, but it depends on the oils. NEVER try a new mix before a concert or rehearsal unless you absolutely must (and in that case, there's probably nothing left on the valve anyway). I had a problem once between nat-synth oils.