Ok. I tried to search

for any mention of using rmcoil on, in, or even around airguns. I didn't find anything. Crossman recommends using it in their guns. Pretty expensive stuff for $9.99 + $16.37 for shipping a little bitty tube. I decided to see if it was cheaper anywhere else. A Google search turned up another gun forums' discussion on its' use. Wow! You would think WW3 had broken out. One guy merely ask if anyone used it. He was instantly swarmed with "experts" condemning both him and it.
That brings me to my question. If a manufacturer recommends a lube and the whole internet says don't use it what would you do? Think warranty issues if you don't use it. Think major gun problems if you do. Big time dieseling is the supposed result if you put it in the compression chamber as recommended by manufacturer. Please don't yell at me for asking.
 
$16.37 in shipping?!? Where are you shipping it, the moon? I have used silicone R/C car lube, and it seems to have worked ok. I believe you can also find silicone lube (definitely great, possibly oil too) at any decent scuba diving shop. Gotta be "100% silicone." Crosman tube is pricey, but is more or less garaunteed to be right. While costly, one tube should last a loooooong time.