The truth about synthetic is that it actually provides better protection under high pressure and heat. It is doubtful that synthetic lead to a seal failure. On a moleculer level the molecules of the syhtetic are of equal size, that is what makes it flow better. With a natural you get what mother nature made, uneven size molecules. General motors break there engines in using a synthetic oil.
The best names in filters are: Purolator Pureone, Wix, AC Delco Gold and the K&N.