IF your airgun is properly tuned then no need for silicone chamber oil. From what you wrote, PELLGUN oil is used on co2 airguns to recondition seals. The manual says use silicone chamber oil because that's its maintenance, they say one drop..use one drop for synthetic seals. Most or all airguns bought at popular stores are synthetic seals. If you get your airgun tuned no need for silicone chamber oil. When I first started, I ordered a tube of the silicone oil and still not even halfway. I only use it every 5000 shots or 10 tins of 500 with only a drop (tuned my ag's myself) still looks good when I take it apart.