KW, I am running the EA Amsoil filter and will go 15,000 and do an analysis. If it comes back good to go...I will keep going.
What Amsoil say's is...lets take a friend of mine as an example. He is a minister and travels 50,000 miles a year. 99% of his driving is highway. This would qualify him to go the distance of 25,000 if the oil stays good.
Second example...lets take me...I do 12 to 15,000 a year, but it is stop and go, idleing, fast, slow, lots of cold starts etc...Amsoil say's I can only go 15,000 if the oil stay's good.
My take, all OEM's have regular and severe service OCI's and all the filter change intervals. Most the EA filters are around 12 bucks...even if you can comfortably go to 15,000 on this filter its still a good deal. I have worked out the cost of Amsoil synthetics@ 15,000 vs. Dino@ 5,000 and we break even.