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an expert on cars vs an expert of cars

an expert on cars vs an expert of cars which is much better to use in a sentence. Which is more popular in English form?

Looking on the internet deeply has found these results:

an expert on cars is the most popular phrase on the web.

an expert of cars

129 results on the web

an expert on cars

163,200 results on the web

More popular!

Some examples and use cases from the internet:

Some examples and use cases from the internet:

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