I have a question for those with this issue: Do you ever or have you ever used plastic/rubber protectant/conditioner on your weatherstripping? I treat mine, at minimum, every couple weeks. I do it for my Camaro and the wife's 2011 Malibu. I'll take a peek tomorrow at mine but I'm pretty sure I'd have noticed that kind of damage by now. I think most people just see the location of the damage and assume it's from misuse.
Also, treating your weatherstripping is in our owners manual(10-96)!
Dear Lord, give me the strength to carry on despite my Camaro addiction!
JRE iTSX tune, full cat-less Dynatech exhaust, CAI intake, Stillen Slotted/Drilled Rotors, RB braided brake lines, BMR lowering springs, 1LE suspension, (reserved for future MODS)