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Hi,
Gates Rubber Co. (a leader in automotive hoses and belts) recommends changing hoses every 5 yrs. This is ideal because this is also, or should be, your Coolant Change interval as well. Also, Porsche recommends swapping their ********************ty Spring Clamps for proper SS Worm Clamps (screw type), so plan on this as well.
The Car won't blow-up if you don't, but that's not the nature of Preventive Maintenance...
Happy Motoring!... Jim'99
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