I own a 2007 Santa Fe 3.3, and a 2014 Sonata GLS 2.4. I have been using Amsoil Signature Series 5w20, and Wix filter on the Santa Fe since it was new,(70k now). I just finished with the last freebie from the dealer on the Sonata. I am now going to switch to synthetic. I like Amsoil, but it is expensive, especially the shipping and handling. My question is: is it worth the extra expense to stick with Amsoil. I am thinking of using Pennzoil Ultra Platinum. My local Walmart sells 5qt bottles for $25.17. I don't know if the Wix filter from Amsoil is made any differently than the ones I can buy locally. I also don't know if there is a filter comparable to the Amsoil EA series. The bottom line is: I plan on keeping both of these cars for a long time. I just don't know if I will benefit that much from the extra expense of the Amsoil products. Would love input from anyone who has knowledge of this. Thanks.