For 420 SEL 560SEL 560SEC and 560SL
This critical coolant hose hardly ever gets changed, and when it ruptures, you could experience a catastrophic engine failure. The chief reason is that it is almost impossible to see and inspect.
1986 to 1991 420 560 V8 Engine Coolant SHORT HOSE Replacement Kit
$19.80
SKU:
GEG-560SHOSE Product Details
It is located under the idle air valve. You can see the age even on this low mileage hose ( under 100K).