I have to laugh, my daughter just came up to me and said "I know how to fix that squeak in the passenger door of the GTS."
I said "OK, show me." Then we went out to the garage and she pointed at the 2 star wheels on the hinge and said it's those. I reminded her that I oiled those before we went out, remember?
She said "Yeah but you need to spin them around to get the oil to go everywhere in there. I just looked at her flabbergast. She was right. I reached down and spun each one 2 full turns and then worked the door back and forth. No more noise.
I can't wait until she gets a little older and we can build a car together, she's going to be fun to work with!