Well i bought a 03 viper from my buddy at the yammi dealer it only had 900 miles on it, i think his dad rode it. they were suposed to have serviced it but i dont think they did, so i thought i should clean the powervalves man i am glad i did they were pretty dirty they were not pulled though but they were fairly tight in there i dont know what 900 miles should look like, but i am switching to amoil interceptor and hope they stay a little cleaner. I havnt yet ridden a viper but i would imagine that it will work alittle better now!!