Only thing to put forward, since it's a Western Arms GBB, they are venerable to propane use, are only made for duster (hence my mentioning only duster in my reply, I assumed you either read into that fact, or you had it upgraded as needed to run propane without fucking the gun up.)
Better grease for GBBs is GunSlick's Annhydrous Graphite Lube, small tube for $1.45 at Le Baron (there are two in Toronto), I use if for 95% of my airsoft grease jobs. You'll find it in the Gun Shop of Le Baron.
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