WD-40 has many helpful uses, including as a way to quiet squeaky door hinges and other moving parts, but is it ok to spray WD-40 on noisy car engine belts?

I have a 2010 Smart Fortwo. The car has covered 30,000 miles and has a full Smart history. In March the auxiliary belt went, which in turn damaged the engine. I have been in dispute with Mercedes-Benz ...