Originally Posted by superman
ya that yummy grey paste that you wiped off of the spring stack is grease used to keep your spring stack from rusting. and it doesnt even come in contact inside the rest of the valve because it is sealed from the piston oring. so i doesn't matter if you use a filter, co2, hpa or a bucket of oil. the reg seat should be kept clean and not dry and oil free.
might want to check that manual again https://www.airgundesignsusa.com/Images/automan.pdf
I always clean and grease the spring stack upon assembly.
I really don't think it's really important to split hairs, you're not my girlfriend.