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14 May, 2009

Do You Need The Pellgun Oil Treatment?

Sometimes we're contacted by folk whose QB78 family air rifle "leaks a bit" and they ask me what to do. The answer is that, before you tear the air rifle apart and install new seals or a new valve, try "The Pellgun Oil treatment".

Here's how...

Take a 12g CO2 Powerlet and add one good drop of Crosman Pellgun Oil to the flat tip, facing into the gun. You can use a pre-used Powerlet as the second one, facing out towards the front of the gun. Tighten the Tube Cap as usual and "dry fire" the gun with no pellets until the CO2 from that one Powerlet is exhausted. Then stand your gun in a corner and leave it for 24 hours. Load new Powerlets and test fire.

Miraculously, the leak will often have disappeared!

So what happened? Well, the Pellgun Oil has been blown through the gun and coated all of the seals and O rings. The oil causes dry O rings and seals to swell just a little and this can often "re-seal" your gun and eliminate the leak.

If this doesn't work, don't despair, just repeat the treatment. Sometimes I've found that a couple of attempts are necessary for success.

Archer Airguns sells Pellgun Oil on our Accessories page at

But if this fails, then you will probably need either one of our Seal or Valve Kits - together with maybe a copy of my 88-page "QB78 Family Workshop Manual". Plan to spend some "quality time" bringing your QB78 back to health. But at least you tried the easy way first...

Oh yes, this trick also works for the Crosman 160, 167, 180 and similar CO2 air rifles. If you have one of these old guns and it's not been fired for years, the "Pellgun Oil treatment" could be all that's required to have it shooting again like new!


Anonymous,  Sunday, 17 May, 2009  

Just given my tired old crosman 160 your pell gun oil treatment. Left it for a couple of days now it shoots good as new. great suggestion. Thank U!

Stephen Archer Sunday, 17 May, 2009  

I'm glad this trick worked for your old Crosman 160.

I also recommend adding a drop to the flat tip of a Powerlet (the one facing into the gun) every tin of pellets or so. This will keep the gun's seals supple and avoid the need for "the treatment" in the first place. But don't over do this or there's a risk of gumming-up the valve mechanism.

Anonymous,  Tuesday, 19 May, 2009  

I tried it too and it stopped my QB78s slow leak. Thx.


Unknown Sunday, 06 December, 2009  

lot of people in the world talk about this pellgun (I also verified it works), now, they say the best lubrificant oil for orings and seals should be silicon oil. so should this pellgun be composed by silicon oil?

they say petroleum derived is not ok for seals and orings

Stephen Archer Tuesday, 08 December, 2009  

I don't know what's in Pellgun Oil - it's a closely-guarded Crosman secret, although some people believe it's similar to automatic transmission fluid for cars. |Like you, I just know that it works and will not use anything else.

And, yes, petroleum-based products should not be used with rubber O rings as they will perish the rubber over time.

Anonymous,  Thursday, 07 April, 2011  

Should I,or can I, use Pellgun Oil in my Stoeger X50 and X20? I have read that you shouldn't use in a PCP as this could be explosive. How about a springer.

Stephen Archer Friday, 08 April, 2011  

I definitely would NOT use PellGun Oil in any spring-powered air rifle. Crosman manufactures a silicone chamber oil and - if you feel the need to lubricate your Stoeger air rifles, I would use that.

Wim Collaris,  Saturday, 06 August, 2011  

How to use the Pellgun with a CO2-pistol (Drulov DU10 Condor),where the CO2-cartridge is install upside down? The CO2-cartridge seal needs to be broken by a needle, attached to the cap. See: .
Do I need to put the drop on the seal or on the bottom of the cartridge?

More info about the gun:

Stephen Archer Sunday, 07 August, 2011  

In this case, as the CO2 Powerlet is installed, I would simply drop a drop of Pellgun Oil down into gas tube and not try to load it onto the tip of the Powerlet.

Anonymous,  Thursday, 02 February, 2012  

I bought a brand new Crosman 760 Pumpmaster for my son. It leaked right from the word GO. I'm talking out of the box LEAK. I put some pellgun oil down the tube. Went to pump it up and it held air. Simple as that. I do believe this pellgun oil is tranny fluid. What was used before pellgun oil?

Anonymous,  Thursday, 02 February, 2012  

It says on the crosman msds chart that it is sae 30 motor oil

Anonymous,  Wednesday, 15 February, 2012  

if it was simply "sae 30 motor oil", so why to buy pellgun oil? it is cheaper the motor oil, isn't it?

Stephen Archer Monday, 20 February, 2012  

I certainly don't know what's in PellGun Oil, but I know it works. And although I'm using it every day on QB78 family air rifles we test, a tube last a really, really long time - like months. For that reason, I see the cost of as being really quite low and I'm personally not going to try something else that could be cheaper but that MIGHT not work so well.

Anonymous,  Wednesday, 22 January, 2014  

Can I use the oil to seal o rings on Co2 powered marker guns such as the kingman training chaser?

About This Blog

This blog shares information, ideas and knowledge about air rifles. It compliments the information Stephen publishes on the Archer Airguns website, on YouTube and the Chinese Airgun Forum.

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