All AAA valves are pre-lubricated at the factory using Magna lube-G Teflon based all-purpose grease.  Valves are suitable and perform best in a low lube service.  For long life, use an air line filter/lubricator installed no further than 8 to 10 feet from the valve.  The filter should be rated 25 pm or finer.  Use a high grade of petroleum base non-detergent lubrication oil no heavier than SAE Low, ISO 32 Viscosity or Less.

Please do not over-lubricate, as this could cause the spool to stick.
Download full AAA solenoid valve service article.