waiting for it to fail, that's not a good course of action as such a failure could end up being catastrophic. Has your Boxster ever had its belt replaced? Now might be the time to replace the belt & also to replace the idler pulley, IMO.
JB/SE SoDak
1997 986 - Wolfi
Yankton, SD
"Wisdom is the most perfect knowledge of the most important truths in the right order of emphasis, accompanied by a total, permanent disposition to live accordingly.
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