My friend have two gallons of FUEL for over two years now, will that be a problem. Is there any indication if it is not good anymore? What will be the best way to check it ?
Meh... I would try, but have a spare fresh gallon to avoid being disappointed. Considering I just spent $30 a gallon on two gallons, seems silly to not try and run it. Just make sure you shake the bottle really well.
How has it been stored? I'm with olds, I would at least try it. I have a 4+ year old gallon of fuel I picked up for $2 that IS still good. My truck runs fine on it but it was stored properly, tight cap indoors in a dark closet.