Delco shocks on Packard.

I would suggest simply going to your local NAPA store and getting some 10w hydraulic jack oil. It's nothing more than a mineral oil, and will work perfectly. and yes, you are right, the plugs at the top are for filling I would fill then to about 1/4" fron the top to allow for expansion and cavitation. Enjoy your smoother ride!

Mark <img src="http://www.aaca.org/ubbthreads/images/graemlins/smirk.gif" alt="" />

One other thing you might try is using motorcycle fork oil, as some contain seal swell to slow down leaks as well as anti foaming agents.