Chinese companies can produce western quality products if they want to.
I trust western QA regardless of where the product is made.
Zonshen is a Chinese company with very little western reputation.
Yes, Chinese car quality is getting much better.
Yes, Zonshen have produced millions of small motorcycle engines.
Talking about cars manufactured in much bigger volumes does not tell you much about the reliability/quality of a small volume specialist engine.
What was their testing regime ?
What faults have occurred in production engines ? How did they fix it ?
What proportion of total engines had this fault ? How many hours ran till this fault occurred ?
I do not expect to get answers to any of these questions.
So we fall back to my original "warm, fuzzy feeling" requirement;
Do you have 200 or more engines with 500 hours or more running in the wild and what faults/number of faults have occurred ?
(single model, we have 20 of this, 40 of that, 30 of this and 50 of that does not cut it)