by Unconventional » Fri May 27, 2011 10:57 am
As long as it's not petroleum based and pure silicone oil, it should be fine for air-soft use. Keep the viscosity weight under 20 though.
Others may have different opinions and/or experiences with their own brand of silicone oils...but I use 10W silicone hobby oil for most of my GBB pistols and GBBR's. For GBBR's I sometimes use a higher weight.