Lubrication of rotary and reciprocating compressors for liquified petroleum gas (LPG) or liquefied natural gases (LNG) such as: - methane, ethane, ethylene, propane, propylene, butane, butylene, butadiene etc. Lubrication of refrigerating compressors using LPG gases as refrigerant fluid, in the oil and petrochemical industries (refinery, drilling platform, recompression post, liquification plant).