Swivel seal leaking

After filling my swivel up with oil its leaking from the seal. Do I fill it with one shot grease or get a new seal. Any advice will be greatly recieved.
Cheers Eddy

one-shot every time.

Yep.... one shot is certainly the first option. If that leaks.... new seals

Surely fix the problem, and then use the one shot grease = long term answer and saves wasting a pack of one shot grease when you have to re-fill it after the first lot has leaked all over your drive and then you've had to replace the seal anyway... from memory when I replaced my seals a couple on months ago, the kits were less than ten quid each...