Depends how bad it is tbh. If its just traces of oil one bottle should do it. If its full of mayonnaise then I'd do it at least twice. I had to do the aforementioned V8 twice.
The cooler should come with an o-ring seal for where it joins the block, but looking at Etka on some variants its a separate part. Worth checking whether the cooler you've ordered comes with one or not.
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