Q: leaking oil on 2002 BMW X5

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mechanic has told me my oil leak from engine is related to th front differential seal. The car does not sem to have the power steering ability it once had. It currently has a slow leak of engine oil requiring a quart per week?. How much should this cost (approx.) to repair?
(1) Answer
We need to know some important info, like what engine, where is the oil leak coming from exactly?
Your engine oil leak can't really be related to the front differential.