Another update: We're officially at the 2 month mark. At this point, I'm becoming concerned that the truck sitting in the same spot for this long is going to cause additional damage, so if I do end up rejecting their offer, I'm getting back a truck with significantly more issues than just the valve body. I drive by the dealership everyday on my way home from work, an it hasn't moved in 7 weeks.
Also, GM denied my claim for the aftermarket tires, level kit, bed cover, and tint to be included in their estimate. Still haven't received the final offer.
Potential issues from letting a car sit too long -
Battery Drain: Car batteries can lose their charge over time, especially if the vehicle is not started regularly. A battery may fully discharge in a few weeks to months, depending on the age and condition of the battery.
Tire Issues: Tires can develop flat spots from sitting in one position for too long. This can lead to a rough ride and may require tire replacement. Additionally, tire pressure can drop, leading to under-inflation.
Fluid Deterioration: Engine oil, coolant, and other fluids can deteriorate over time. Oil can become less effective at lubricating the engine, and other fluids may separate or become contaminated.
Rust and Corrosion: If the car is exposed to moisture, rust can develop on the body and undercarriage. Brake components can also corrode, which may affect braking performance.
Pests: Rodents and other pests may take up residence in your vehicle, potentially causing damage to wiring and upholstery.
Fading Paint: Sunlight can lead to paint fading and damage if the vehicle is not covered or parked in a shaded area.
Fuel Degradation: Gasoline can degrade over time, especially if it contains ethanol, which can absorb moisture and lead to phase separation.