Serpentine belt silent or makes intermittent squeaking noise at any speed or idle. Mechanic says defective belts on market now & not worth spending money to replace as could do same thing with new belt until market purges defective compound belts. Belt ok just makes noise. Is there an additive I can put on the belt to eliminate noise then reapply when it comes back? This is my daughters POS car & she has no budget & on my payroll so I'm just trying to get it to hold together until she is graduates from UWSP in 2 years.