What I'm picking up on is that when you turn the wheel for a short period of time, you do not notice the smell. Only during a loooong turn does the smell become apparent.

I have had PS hoses leak only when power assist is required. I've seen this on several cars.

Pop the hood, get someone to sit in the car, and start it , then turn the wheel to one side or the other. Don't jack the car up, the resistance is what pressurizes the hoses.

Looks for leaks in the hoses.

Jim

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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles