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Question: I had my belts changed recently

2005 turbo GT I recently had my serpentine belts changed because one broke on me. The garage said it was good to change both belts (this is know should be done at one time) but the belts were change this past October. The prior owner had the timing belt change water pump idler pulley timing belt tensioner and both serpentine belts. I am now since the belts have been replaced getting a squealing sound. They told me that it may be the idler pulley and will have to pull everything apart to check it out and to check out the pulley they would spray it with wd40. I know that you should not use any type of lubricant around the belts because it will cause a squeal. I was also told that they did spray the idler pulley to get the belt on. I went to the garage that did the above replacing and the mechanic told me that he had the same problem with non factory belts and when he called the dealership he was told he needed to use factory belts and after he put them on the noise went away. Should I replace the belts again with factory belts or will that noise go away