There is a sale in Canada at NAPA stores. PU is going for $28.99 for a 5 litre jug (top line synthetics can go for $45 to 53 per jug up here). So I went to a local NAPA store to check it out. The sales rep opened a carton of 5W20 right in front of me and took out jug. I read some info on the back of the jug and then checked the date code. It was Dec 2011. That's 1.5 years ago. I know the shelf life is more than this, however, i have a touch of OCD. What do you folks think?