Cleaned the garage this morning and found my stash of Amsoil ATF. What is the shelf life of this product? I think it has to be about 10 years old.....maybe 12. I am thinking about doing the multiple drain - suck out the dipstick hole - and fill on the 2007 Quest but have some concerns since the ATF fluid is older than the van. There are 9 quarts that are all unopened. Your thoughts? EDIT: There are only 5 qts. I would have to mix it with something else if I were to do the multiple drain and fill option. My Amsoil dealer membership expired two weeks ago and I am not planning on renewing it currently.