If you really want two diff jugs, buy two identical, take a pic of receipt while still at checkout, tell them you got wrong jug and return and get what you need right there.Watch out for the fine print. You can only place one checkmark for two jugs of identical product. There is no way to check off one jug of high mileage and one jug of Euro. I submitted mine with two jugs of high mileage even though I bought one jug of high mileage and one jug of Euro. I'll see if it goes through. For my son's purchase of PUP, it's two jugs of it so no problem.
Technically, you can return both jugs and with a pic of a receipt get $30 back (if you went with PUP) while in the end spending nada. They didn't think this thru.