I purchased a brand new 2016 F-150 with a "lifetim...

I purchased a brand new 2016 F-150 with a "lifetime Powertrain" as advertised. This truck has needed the rear end replaced 3 times, which they could not do correctly and had to be taken elsewhere after their failed attempts. Its been a laundry list of things that have gone wrong with this truck from the transmission to torque converter, etc. I have completed ALL of the required services in order to keep "lifetime warranty" valid, but was told because I didn't have the receipt for my 30k oil change they couldn't honor the warranty (the contract does not specify this either). After just getting it back from them its back in the shop and once again are trying to avoid honoring the "lifetime warranty" and make no effort to rectify the situation. The dealership and service center are worthless and you should purchase your vehicles elsewhere.