Just get some RC car silicone shock oil. Here is a great selection -https://smile.amazon.com/s?k=silicone+shock+oil&crid=1ECPHMU8HN1E&sprefix=silicone+shock+oil%2Caps%2C95&ref=nb_sb_noss_1
I would say 20 or 30. Whatever Pellgun oil is. You can get from 5 up to about 200.
What is the purpose of adding tungsten disulfide to silicone oil?
Is this oil good for use on other pellet gun seals?