Personally, I never bother with the stuff.

I recently resurrected an OS 46FX that I bought in the 80's. In the last 20 years this engine has gotten used sporadically but spent most of its time sitting on a shelf, or in an airplane that was not being flown.

It also spent time in two seaplanes where it got dunked more than once.

I just pulled it off the shelf to put in another seaplane which was test-flown this week and it still screams like the day it was broken in.