Just thought of another vehicle motor from the sixties and seventies that would run 300k miles very regularly the Chrysler 225 slant six. Very anemic power wise but would last forever. Seen several in industrial equipment as well. I had a new 1984 Dodge with a 318 that I drove ten years and 200k miles. I sold the Dodge to a friend that drove it another ten years. It was then sold to the son of a person I worked with. He drove it several years and sold it to a teenager that lives just a few blocks away who is still driving it. The transmission was rebuilt but the engine is still original. For the first 20 years Mobil One synthetic oil was used after that I have no idea.
