Originally Posted By: YANCEY
I would like to know what the best filter for my 5.4L or just stay with MC 820?
There IS no "best filter". M1 and AMSOIL are considered to be top notch, but are expensive. Purolator Classics are inexpensive and highly regarded as good basic filters, but are lacking some of the more desirable features such as a silicone ADBV, threaded-end bypass, ...and so on.
I think the general consensus is that including all the factors, such as price, availability, features, build quality, etc. the Motorcraft FL820S is considered the best overall "choice" for Ford products.