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.
I would use Crosman Pellgun oil. Or RWS air gun oil.
Go to airsplat and you should find what your looking for. Or you could look up "air gun repair" on the web.
See the link below for the Owners Manual. It will tell you how to take care of the 347
Search the web. There are shops all over the place that modify air guns. (air gun repair). They modify the trigger and several of the internal PCP parts for more accuracy. A simple solution is to place a flat soft sponge and FEW drops of Crosman Pellgun oil in the bottom of your pellet tin. This will lubricate the pellet and the barrel, doing so will increase your velocity. Do Not over lubricate the pellets.
lets start with. Who made the rifle? there are over 100 different companies who have made air rifles.
You can still order 1077 parts from Crosman in New York. See the parts and owners manuals link below. Then contact Crosman Customer service and order your parts.
Crosman still has parts for this rifle. contact Crosman at the link below (Customer service) and order the parts you need.
it all depends on the condition of the rifle.
The Crosman 140 Air Rifle was made from 1954 to 1968 in four different variations. Crosman no longer makes parts for the rifle but you can still get it repaired. The Crosman home page offers a "Find a repair center" button on their first page. From there you can locate a center that has parts for your rifle. See the related link.
Crosman does. see the link below for the parts list and how to contact Crosman.
Crosman owns both the Benjamin and Sheridan line of air guns. See the link below for the Marauder parts list and the customer contact page for Crosman ( They sell parts for the PCP rifle.)
Stay away from commercial lubricant's. I suggest that you use only lubricants designed for Air rifles like the ones made by Crosman ( Perllgunoil) or RWS. Other oils may actually damage the seals in the rifle. Never use a firearms cleaning agents on Air guns they will damage the seals. Remember Real Firearms don't use o-rings like Air rifles. Follow the instructions for the proper places to oil the Air rifle. If you have a C02 rifle or pistol put a drop on Air gun oil on the tip of the C02 cylinder just before you put in the the gun. So when the tip is punctured it will lubricate the inside of the air system. Also take a flat thin sponge and put it in the bottom of your Pellet tin with a few drops of oil in it ,this will lubricate the pellets and the inside of the barrel. When you clean your rifle with a cleaning rod run the patch through the barrel until it is clean then I run a patch with air oil on it inside the barrel to keep it from rusting. Did you know that Beeman sells quick cleaning pellets that you fire through the rifle or pistol to clean the barrel. I think they are the only ones who make these. I clean the barrel about every 400 to 500 shots depending on how much I use the gun