Most who have a side mounted oil cooler, cut holes in the fender liner behind the cooler to vent the air. And glue a mesh screen over the holes.
You shouldn't have turned the oil cooler upside down. It will drain back into the oil pan with the engine off. With the engine off. You will read one level. With the engine running. Your oil level will drop to fill up the cooler. It's hard to get the right level with the upside down cooler. There have been a couple of threads on the subject.
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