For other-than-chip purposes:
(Bob Is The Oil Guy)
https://www.bobistheoilguy.com/forums/ubbthreads.php
Jokes apart, shower them and wipe them clean first, before oiling.
It's called mineral oil in North America, paraffin oil in Europe, and I understand they can be sold at totally different places in the respective two continents (for best results in a Continental Pharmacy, ask for a carton of condoms too).
Use a clean shoe-shine applicator. NOT more than half a teaspoon of oil to apply on the sides (as 20-strong barrels) of 100 chips.
Having done that, use a soft micro-fibre cloth to wipe the excess oil from the sides of the barrels.
Now, with the slightly oiled cloth, wipe the perimeter of the faces, one-by-one (I'm sorry; CPCs need some work for best results).