FWIW, my fluid was kept clean and the PM still failed due to a bad accumulator. The motor running with every press of the pedal caused it to burn up (I smelled it burning). So maybe the accumulator lasted a little longer with clean fluid, who knows. I was on my third PM at the time. I've been taking some long trips recently so I needed a more reliable system anyway. I didn't want the PM to fail 6 hours from home. So I went Hydroboost. I took the PM back to Autozone. Cardone fixed it under lifetime warranty and I sold it at a Buick show. At least I assume it was fixed as I never installed it again.