I guess where they live plays a big part. Something that spends its life on the coast in the sea air will be worse than a car from the middle of London. We have just come back from a weekend on the coast in Devon, the car had a fine layer of salt all over it. The last thing a ford needs is a salt bath

My old mk7 fiesta was a 61 plate, I bought it at 5 years old and the back box had to be replaced as it was rotted through.