Now I hope most of us are trying our best to go with the 0w-20 with some degree of success. I have been looking around here (IRL) for a full spec 0w-20 oil that is a little bit easier on the wallet per oil change. To that end I am considering buying in bulk (with the possibility of splitting cost with a few other folks). Now the question I have. How long will a fully synthetic oil last sitting in a closed but previously opened container in the shed? Will it oxidize or 'go off' like many of the other petroleum products? Only luck I've had is sourcing a 208l drum (price unknown for the moment). If I can divide it 4 ways still leaves me with 52L; with approx 4L per change twice a year it will need to sit there for about 6 years possibly more as I don't do an awful amount of miles at the moment. Its a lot of cash to loose if the oil gets contaminated or becomes unusable and given my liking of Honda I'm sure at least one car in the household will use the oil in time. Any thoughts or ideally study's folks have run across?