I have been wondering what type of "testing" or other criteria is used to determine how many miles an oil filter is rated for. I get it that there are better media in filters as you go up the ladder in filter quality. My main thought pondering was the basic blue STP filters that are marked 5000 miles. I am pretty sure these are being used on vehicles with oil life systems that take a car past 5000 miles so what's the risk? Will the filter have less capacity and go into bypass mode or is the quality of the media at risk for getting all twisted looking so we see in some cut opens? I source my oil filters for customer oil changes from AZ but always get the extended life filters just for the additional mile rating to match the average oil change interval of more than 5k miles....but I can save an average of $4-5 a car going to the blue filter.
Thoughts? opinions?
Thoughts? opinions?