How many miles are these vehicles driven annually? Do you perform oil analysis on any of them?
Here is a link for the Wix filter look up - http://www.wixfilters.com/filt...=51080&Submit=Search
Wix 51080 (application: all 8 cyl Packard models) - Beta Ratio: 2/20=6/20
Nominal Micron Rating: 21
One man's collection of Packard memorabilia - http://www.letsongaragesale.com/index.html