2010 Lincoln Navigator, 161K, original timing components but needs them changed. The replacements are in a box in the garage. I'm just lazy. For the 30K I have owned it, I have run Havoline/Chevron ProDS 10w30 and changed every 5K or 6 months. The OCIs from the carfax that I saw before buying this vehicle were not that great, 7-9K mi at quicky lubes, but at least it got changed some. I'm wondering if full syn 10w30 at 5K intervals would have prolonged the life of the factory components. There's a guy on here with a 5.4 3V Expedition running Amsoil who has over 300K on his with the original components.