no, you should neve have any kind of liquid or grease anywhere near electrical parts, i would reccomend removing the viedo card and getting a can of compressed air and blowing it out, that should solve your prbolem, but if you absolutely lubricate it, i would try and remove the fan, lubricate it, let it sit for like 2 days and dry out, then replace it (dont do this while its on the card or you WILL RUIN YOUR CARD) but i would definately try compressed air first