I recently came across a case (12 individual quarts) of HD syn3 20w-50 motorcycle oil. Being that i own a sportster and will only be able to use 4 quarts of it at a time, i was wondering if perhaps anyone knew if motor oil has a shelf life or if anyone knew the best conditions to store oil in order to keep it fresh. Right now its out in my garage in 0-15 degree farenheight (sp?) weather. any information would be extremely helpful.