The maintenance ones are very messy to use.
Not an indoor job!

And to be honest I didn’t notice a big difference in the ones I did.

Pellgun oil or similar will stop some leaks in some co2 guns but can be bad news in others.

I do think that we have more leak and piercing problems now with the numerous co2 capsules around.
They are not all the same and I tend to stick to the ones Recommended by the gun maker.