Extended oil changes mean different things to different people. I only go 8K miles between oci, to some that is long, to others that is short. I base my oci on a uoa (used oil analysis) program, so I know I am safe with the oil and filters I am using. If we wanted to go extreme for really long oci, we should be talking about by-pass oil filtration! Not sure how an article from 'Modern Tire Dealer' got in here about extended oil changes, it looks more like an add for Purolator, which is my filter of choice (standard version). This add says all Purolator oil filters are compatible with synthetic oil, which is the point I was trying to make, no special filter needed for synthetic oil. It also says to take advantage of extended drains, thre are more effecient filters on the market with diffrent media, the point you are trying to make. What is an extended drain is the question the operator needs to determine, I do this with a uoa. Pertaining to the Valvoline FAQ link, they say 'use manufacturers recommended oil change intervals', looks like a statement to stay out of court to me. What would Amsoil say about this? Valvoline also says you can use any type of oil filter with their synthetic oil. Personally, if you are going to mess around with extended oil change intervals, you take risk, but a good oil sample and a good used oil analysis program will keep you safe with whatever oil filter and lubricating oil you wish to combine. Good links! Philip.