Yeah, I used to spray WD40 or plain old silly-lube on badly worn belts to see if they were the noise, or if it was something else. If the noise stops, it's the belt.
I don't replace them till they give, though.
Any more, I don't bother. I just wait till something gives out, fix it, and move on.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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