Some cooking oil questions

[Mobsta]

How long should a bottle of sunflower oil last before it goes off, if stored in a deep fat frier? Doubt I'll be able to keep it airtight without taking it out. Should it be stored airtight?

I snapped up a cheap pot/wire basket combo frier from Tesco for under a fiver... I have enough bread making/sandwich toasting devices which never get used (waste of space) so I never could bring myself to buy a proper deep fat fryer.

I dont deep fry anything, so went for sunflower oil, which I guessed might be the best choice...?

Edited by Mobsta on Friday 17th July 00:06