Replaced every coolant and power steering hose on my e70 while I had the motor out. They were still going strong at 196k miles 315Mm (k km) but it was ∞ easier to replace with engine out of the car and about 15% of the price of the replacement motor.
My e53 was 205 k miles and 22 years old with all original hoses so it's a little crazy hearing those ages.
Is your temp running outside of normal? Your pressure cap not releasing pressure? Is the coolant mix correct so the boiling point is high enough to keep pressure down? Seems there has to be some systemic issue.
I would do a head gasket chemical test on the coolant to at least discount combustion gases pressuring the coolant system. (often the cause of frequent hose failure).
–awr–
Using Tapatalk VIP on iPhone