Originally Posted by ap27
The AI Propane adapter oil is lightweight and good for lubricating o-rings and other small/lightweight moving parts.
For heavier parts, like the contact points between a pistols slide and frame, or the bolt in a GBB rifle, you would be better off with a heavier weight of silicone oil (basically heavier weights are more viscous, also known as AI Tornado grenade oil) or white grease.
Viscosity is the ability of a substance to flow, so grease is less viscous, not more.
On another note, I find that graphite lube is awesome for GBB slides.