Oil is oil. Gun oils just have different additives.
Oil it with "Crosman Pellgun oil", "RWS OIL" or "Gamo Pellet gun oil" Wipe it down. DO NOT USE Household oil or 3-N-1 oil. They will damage the gun. Put a drop in the barrel and run a swab through the barrel. If it's a C02 gun then put a drop of oil where the C02 bottle fits into the gun and charge the gun. If it's a springer type of rifle, put a drop of oil in the oil hole in top of the rifle barrel or in the loading chamber. DON'T over oil the gun.
This is a little hard to answer because you didn't state what type of air gun you are trying to oil. Is it a C02, Pump, Springer, Nitro or PCP air gun. But let me give some general rules. First NEVER use regular oil, it will eventually eat the seals. Only use air gun oil like Crosman Pellgun oil, RWS oil or other pellet gun oils. Regular oil is not good for airguns. Oil the moving parts but don't over oil them and make them sloppy. there are some excellent videos on air gun care on the web I suggest to take a look. See the link below.
1010 SPECIAL HYDRAULIC OIL
Not the ideal, but to some degree, yes.
Special 2 stroke oil for yard machines they have at hardware stores in that section.
It is special oil called Supercharger oil. www.superchargersonline.com/product_detail.asp?PartNumber=SCOL-GM-OIL-2
Depends on what type of oil you use, some paint do contain oil
the biggest one was the oil embargo
Depends on the manufacture and the size of the pump. These pumps use a special oil so contact the manufacture for the exact amount and type oil.
Simply what ever is on special @ your local parts store.
I suggest Crosman Pellgun oil or RWS pellet gun oil.
The type of hydraulic oil you want is at any place that services audi, skoda, seat or vw....it a special oil so don't go throwing anything in there....hope that helps