Don't really see the point in this service apart from it being a nice little earner, asking a general question then a forum like this or another not dissimilar would elicit replies from a cross section of people of all experiences.
I'm a member of an MB and BMW forum both independent and both excellent for good advice for free, which as anywhere needs to be carefully weighed as opinions vary...BMWland in particular is a mine of very good info, their ongoing threads of thousands of posts about potentially disastrous swirl flap issues on BM Diesels has been very useful to us, would a general mechanic in such a service referred to in the OP have that specialist knowledge.
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