97 w/74000 and very occasional noisy lifters. Extremely clean, oil changed more frequently than needed (since I am going out to the desert for a couple of days, I just changed my Mobil 1 tri synth that had just over 4k miles with some regular Penzoil 10-40. When I get back, I will change it again. My amsoil perform air filter lets in some dust so I am sure to swap out fluids fairly frequently. Synth I usually let run 5-6k miles. I have gotten a Bilstein flush every year past 3 and will do another one when I get back.