My method is typically done after a flush when the components are all disconnected, so it shouldn't be a whole lot of extra work. I learned this method from the pros on autoacforum.com and aircondition.com.

Conversely, if the components were not all disconnected, why would the whole system need an oil recharge? Just replace the oil in the component that was removed.

It's not critical to use my method. I'm sure your method will work. But why not give the system a good start during a complete oil recharge?

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95 E320 Cabriolet, 169K