By all means contact your dealer, but I will give you some of my thoughts…
If there is oil leaking from the bottom could be refrigerant oil indicating a leak. However I would think if you were low on refrigerant you would have a lack of cooling.
Sometimes oil does get on and in the base pan when the unit is charged from the factory, no big deal.
Loud noise in low speed is usually a flooding condition. This can be from lack of airflow, wrong metering device (should be a TXV) or overcharge to name a few.
These units are usually super quiet in low. I just helped a dealer start up his first one last week and it is so quiet on low he didn’t know it was running.
Good luck
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