A friend of mine (X5 3.0I) has a fluid leak just where the oil cooler hoses are threaded into the transmission. He replaced the hoses and the o-rings but the leak is still there. Is there a no-return valve or something which could create a higher pressure at this place?

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BMW X5 2001 3.0I
ALFA-ROMEO Mito Turbo-Jet
Many mythical italian brand Laverda motorbikes...