Okay - we already know it is not an Oracle issue and also that it is not a linked server issue; we know this 'cause you stated that you can query the Oracle view from SQL Server, is that correct?
What happens if you query the SQL Server view on SQL Server? do you see the data?
If the answer is NO then the issue is with the view - SQL Server issue.
If the answer is YES then the issue is with Excel
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Pablo (Paul) Berzukov
Author of Understanding Database Administration available at Amazon and other bookstores.
Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.