You guys are confusing yourselves.
"Right kind of Propane"? Propane is propane. "Green Gas" is propane.
There are basically 2 kinds of airsoft gas, HFC134A (Duster Gas, sometimes called green gas incorrectly) and Propane (Green Gas, sometimes incorrectly called HFC22, also called Red gas).
Some have different additives for scent (used to detect leaks) and lubrication. Some are bottled at different pressures, and some have different gasses mixed in (like Butane, CO2, etc).
Use Propane in your GBB and you will probably notice no difference.
I do not rely on the lubication in the gas can alone anyway, so lubing my pistol hasn't changed a thing.