Parkerizing end-treatment

I am home "Parkerizing" a pistol-phosphoric acid and manganese dioxide- and am wondering what type of oil to use after the final rinse...I have heard of using everything from motor oil to auto transmission fluid, so apparently the options are many. Thank you in advance for the advice.

R.W. Rexford
- Seattle,Washington

Good ol' fashioned gun oil will give corrosion protection and a nice finish.

Dan Brewer
chemical process supplier - Gurnee, Illinois

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