During my last oil change at the 21,000 mile mark the technician noted hearing a belt "squeal." The service manager suggested that if it persists bring it back in and they'll replace the belt, assuming it's the source of the squeal. When I got it home I lifted the hood with the engine running and couldn't hear any squeal, or a hint of a squeal, but after thirty years in the field artillery my hearing is somewhat degraded. I don't see excessive black dust buildup on the front of the engine, but when I run my hand underneath the belt (engine off of course) there is a black film coating my fingers. Now, I believe this is most likely normal, but would like to hear other forum members' opinions. And my last question deals with the "ziptie method" of installing a new stretch serpentine belt. I understand how the various installation tools work, but can someone please explain how to do it using zipties instead? Thanks ahead of time for your responses.