Can anyone verify which is safe for pcp innards

Bigragu,

From what I can find the RWS air chamber lube with needle applicator is silicone oil which is what you want. I can’t find anything on the Beeman chamber oil, but my best guess is it is also silicone. Both RWS cylinder oil and Beeman spring oil will definitely diesel. Hope that helps. 

Lube for what purpose on your PCP? It needs very little. Do not use a silicone based grease anywhere that it might migrate onto a threaded part. Under high pressure/heat it can cause seizing. I have used a light application of Mobil 1 synthetic oil on the hammer, and any good grease lightly on trigger surfaces. There are purpose made O ring lubes, but some are silicone based.If you use any, just get a light coat on your finger and rub the O ring with it, then dry your fingers. There should not be enough lube on the O ring to be visible as such. Most PCP O rings are in static applications, and clean and dry is fine. I realize that many sources recommend silicone, but I have had this warning given to me by a well-known air rifle designer and builder whom I trust totally. He has seen valves and threaded reg bodies seize up totally by the use of silicone lube. 

I use minimal silicone grease on any areas of the gun that see high pressure. Otherwise I would use very conservative amounts of very light oil on other bearing surfaces(hammer, spring,guide) as viscosity changes with temp and can alter performance. A very good polish on the same surfaces will yield stable results oils and grease xan not. 

Otherwise as a general rule any petroleum or otherwise flammable lubricants should be kept away from pressure tubes(pcp) and compression chambers in spring guns as a rule. 

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Shoot 44 I'm confused. Are you referring to a spring gun or PCP?

For my PCP, I dont find silicon oil to be needed because they are no good for metal to metal contact. For O rings at static parts, silicone grease is better because it does not flow away after being applied. The most-used lube on my PCPs are: 

Superlube grease PTFE type : they are good for O rings as well as metal to metal contact. Very cheap also.

Krytox GPL 104/105 oil ( different viscosity ): the most slippery oil I have used. I also use it on my lathe and milling machine with good results. Good for O ring as well as metal. They are a bit expensive but I think they are worth it.

However, none of the above are very ideal for soft metal like Aluminum or zinc alloys. I could feel the metal surfaces rubbing against each other when I intentionally applied pressure . The only lube that produces a feeling of a smooth slide is the PG-2 spring grease sold by Vortek ( http://vortekproducts.com/ourstore/Airgun_Grease_Spring_Lube ). I know its synthetic but I am not sure if it will detonate under high air pressure so I have just been using it at locations not under pressure. Since It works so well on soft metal, I am very tempted to see what will happen if it is put under 4500 psi. May be I will try it out in the gold filter of my Yong Heng some time .

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elh: Guess I am still in shock about turning my springer into a firestick and rambled on a little (lot) too much. Seems to me that both the innards (air chamber) of a springer and PCP act the same if ANY oil is present- BOOM- so guess I was talking about both. That said I am confused also. What good is silicone oil except to put in things like a Nomad II where O rings are moving against metal? It doesn't work for things like hammers, triggers, threads and latches cause it doesn't lube metal to metal parts very well and WILL cause parts to bind if under load and WILL diesel if under pressure . Maybe in a CO2 gun but I use Pellgunoil for that. End of rambling.

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It is my understanding that, in the application to which you refer, O ring against metal, a silicone based lube is okay. Where it is a problem, if it migrates to threaded or other high-pressure metal-on-metal surfaces. I have used pure synthetic oil on the hammer in my PCPs, would not use any petroleum based lube in there, and only a light coating of the synthetic. I expect you are right, a heavy dose of petroleum lube ahead of the hammer could be trouble in a PCP.

RWS Air Chamber Lube is silicone according to the ads on Pyramid Air. That’s what I would use on Mrod o-rings.

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Hi Bigragu.....pretty sure it was the chamber oil. It seemed Beeman was always warning about any other oil that would cause deseiling in the chamber. I had an R10 deluxe for a long time. I liked your thread on the HW90 by the way- but that’s off your silicone lube topic....on to the new lubes. Hope they work for you!