Stop chair from squeaking?

My office chair (swivel, reclyning back, standard desk chair), which is less than a year old and high quality (over 300$)is squeaking like crazy! I've put over half a jar of wd-40 in all the crevaces, springs and bolts, it has barely made a difference. I am using the chair the same way, I weigh the same as before and use it the same amount as I used to. How can I get rid of the squeak completely? Thanks!