If the hose is old, I would consider replacing it, my lower one broke early after 6 years of ownership of my vehicle, it was not the hose's fault, it was rubbing against the chassis and that finally took its toll on the hose, had mine made specially with industrial grade stuff, also wrapped up some extra rubber in the place where it rubs against the chassis. Its more for piece of mind, a broken hose can leave you stranded in the most unlikely of places.

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99 Gurkha with OM616 IDI turbo

2015 Gurkha with OM616 DI turbo

2014 Rexton W with OM612 VGT