Tuning Refurbish a Diana 45

I had purchased a Diana 45 about 12 years ago from a pawnshop because there were some birds possibly magpies or ravens messing with my roof shingles. I don't remember every shooting at the birds but had fun doing a little plinking with the gun which brought back memories of my first major purchase of similar Beeman 30 years previous to that.



The gun has sat in storage for all that time. I want to start using it again and also bring it back to its full potential. The gun is in near mint condition and was seldom used before I owned it and I probably put a few hundred pellets through it. The details are on the top of the Gun "Diana Mod 45", "MADE IN WEST GERMANY" serial # 692976, .177 cal.



The breach seal looks very good, but the assumption the piston seal is going to be very dry, especially because I live in a dry climate. Should I pour some oil into the piston area? I do not have any specialized oils other than gun oil, 3 in 1 and other household oils, nothing air gun specific. All other info and suggestions appreciated.
 
I have an old model 45 I bought new back in the 80s. Got a good deal on it cuz of a nasty scratch on the stock. Has the newer seal not the leather one. Shot thousands of rounds through it and went through several scopes. Very accurate and well built guns they are. Scope killers they are also. No such thing as Bullseye scope mounts back then.

It and my model 52 have been waiting to be used for some time now as I got a 54 and it is my go to springer these days.

I wish you luck with the 45 now I expect I will have to take mine out and shoot it.