Just to add, since the YS 400 is part of this discussion.
Dad bought his 69 GTO brand new and of course was the family car for decades. Still owns the car today. He daily drove it right up through the early 1990's before the cars first semi restoration, still running the original engine that had never been opened up. Nothing but pump gas in this thing from day one, and knowing dad he didn't always put the highest octane in it either. He put 180,000 trouble free miles on that engine before the first restoration of the car itself, but the engine was left untouched.
After that it was driven as a fun weekend car for the next several years and continued to put miles on the original engine. The engine had close to 200k miles on it before it was finally pulled out for something bigger. Was still running like a top and now lives a shelved life.
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