Old valve lifter

[Radek]

Hello group;

I was checking valve lifters on the NG engine lately, and one of them seems soft (goes down by a few milimeters when pushed down, with camshaft lobe disengaged).  I have an old (10+ years) valve lifter in my parts stash, brand new and the correct part for that engine, but by now probably completely dried out.  Are there any counterindications to installing it?  I know valve lifters should always be stored upside down and filled with oil, but this one wasn't. Should I soak it in engine oil for a few days prior to installation?  Soak in diesel fuel perhaps?  WD40?
Thanks!

Radek
88 90Q
91 V8Q 5-sp.