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A recovery machine can take out that oil which has been dissolved in the refrigerant in the system... Unless the recovery machine is running a flush liquid repeatedly through the system I am convinced the pockets of oil will not be removed....It is not my impression that that is how they work. We know the recovery machine can not take out the oil in the dryer-receiver or remove the moisture in the jell beads either.. thus it has to be replaced any time the system is exposed to the atmosphere.. either by leak or intentionally by opening the system.
Even on NON low spots ( detached hoses for example ) the MB factory flush machine runs the flush through the system multiple times running it through a filter in the process. Perhaps even two directions....
There are not that many parts in the system. The MB AC FSM gives the basic bottom line trustworthy method. Any other method and you risk having to do it again and replace any affected parts again.
It is your right to chose whatever method you want... as I assume it will be your cost if it has to be repeated or causes further inconvenience ..... the chance that someone who suggests an ' easier' method.... if that does not fix the situation....will put up the money to correct the situation is very slight at best....they have no skin in the game..... so I think it is important to give conservative ( MB FSM for instance ) fail safe advice for some types of systems.... and the AC system is simple but unforgiving if the rules are not followed with regard to what is inside the system.
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