When you say rear, do you mean rear of car or rear of engine?
If it's rear of the car, it could be oil leaking from a shock absorber, or possibly brake fluid leaking from a brake line.
If it's from the rear of the engine, it could be any number of things. If so, I'd be parking it over sheets of clean paper and seeing if it looks like oil, or another fluid like coolant/brake fluid etc
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