I was short on 5W30 and had lots of synthetic 0W20 on hand - which I use in my 2008 Toyota Sienna - so I used the 0W20. I'm curious as to whether there is an issue with using 0W20. All of the facts that I have seen show that 0W20 provides comparable protection, while improving gas mileage and reducing startup wear. I would love to see some facts that confirm or deny the acceptable use of 0W20 in the 3G Altima. Appreciate your assistance.