They claim the brakes are fine and squealing is normal. An occasional squeal is considered normal. A continuous squeal every time the brakes are applied is not normal. The possible reasons for squealing are glazed brake pads and rotors, vibration of the brake pads, cheap quality brake pads, or pads that do not fit tightly. These are updated parts and should eliminate the majority of your squealing.
Theses are the plugs that the truck originally came with.
Platinum spark plugs should only be installed in vehicles originally equipped. They have a tendency to foul easier than the standard plug and cost more money. On weekends the car is not used. Come Monday when I start the engine it makes a sound like a diesel engine for 3 to 4 seconds. My husband says the oil is not getting to the moving parts fast enough.