It is a strange concept that a lubricant is applied to a drive belt. Even stranger when Mercedes actually produce a product called "Poly v-belt lubricant". Perhaps it is a misnomer. Ultimately I suspect, as Ali Al-Chalabi says, the sensible thing to do is change the belt. The lubricant may just buy me some time, but in the long term it will need replacing.

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Stuart Dyer
'94 E280 Auto