I would not recommend this as its very unlikely to work or if it did would only work for very short time but if you do make sure you only use silicone oil
best fix is a full seal kit very easy to fit just take you time take pictures as you strip it like some have said make sure the transfer port adjuster screw is out
There is an fx service kit available containing all the seals etc needed for a complete strip down and rebuild. Takes about half an hour to strip down or less, unlike the one i am doing at the moment it isn't seized solid from years of neglect. Had to use a broom handle from the front to get the valve body moving and the pellet probe was green and stuck in place. Not sure the customer had used the rifle in years or has just bought it to find it is a very sickly rifle indeed.