Interesting. I had the bonnet open a couple of weeks ago as my father in law likes looking at engines. I'd actually never bothered opening it before myself. But he noticed those holes immediately too.
He was more concerned about water and mud coming through from the wheel arch into the engine compartment but I'd done some driving in very heavy rain recently and the engine bay was spotless so it doesn't seem to be an issue.
Hadn't thought about corrosion but I don't live in an area where this is much of an issue. Plus there's the corrosion warranty anyway.
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