bit different i know... but very gun related

i remember an old chefing trick to proof a pan (to make non-stick) was to take it up to a high temp... pour oil on and leave for a day or two... repeat a couple of time's ect.

the question is... what would be the safe temp to bring a piece of aluminium alloy up to, without damaging the structure... to bathe in "oil".

metal expand's when hot... and absorb's when cooling if im right?

how many time's could you repeat this process safely... 3-4-5? and would the alloy abrorb the "oil" over a long soak??

grateful for some "different" advice sneaky