Tried this filter for the first time on my last oil change. I've religiously used Pure One filters, for 70K miles with either Castrol or Mobile1 full synthetics. This filter is great. Though I try to change the oil every 5K, this one is designed specifically for synthetics and claims to extend the life of the oil to 10K. It's at 8K now and I'm very pleased with the oil color and the smoothness with which the engine still idles.