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i spray mine with silicon every couple months, works fineMy rear driver door was squeeling I sprayed some Lithium white grease on the hinges without sucess. Then I noticed the sound was coming from higher : it was the upper rubber part of the door seal that was rubbing the weatherstrip on the body. I sprayed some grease both on the dorr angle and the weatherstrip and now my door doesn't make any noise anymore.
I had the squeal on the rubber trim on top of the rear passenger door... sprayed silicon spray, lasted for about a month and eventually came back...
I didn't want to cut into it so it's just one of the things I do when i detail the truck, spray the hinges and hit up that door..
My little squeal comes from the front top corner of the door sliding on the rubber as the door closes, its not a big deal as it only does it in the summer...