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without trouble shooting id say it would most likely be either the oil filter is cactus and is leaking, one of the many rear seals may have been warn over time and no longer retain the factory seal so they should be replaced (this can be filter and engine located seals) or a oil line pipe has a puncture or a loose connection, (without knowing what engine make model etc, this is a very broad diagnosis)

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Q: What causes oil leak all over the back of the engine?
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