Where do they say full flush is not possible?
Again, depends on definition of 'full' flush. Couple of drops will always be left.
If you have choice between normal procedure and the 'plus service' where they do oil change with a machine by connecting it to oil cooler line just go for second option as in this case they will change almost everything in the system.
Tell us what your concerns are.
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I'd rather drive on left
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