The MoT test is valuable reassurance for amateurs who do their own servicing that their car is in good condition. You get all the professional checks a garage does during a routine 'service' for a fraction of the price.
Advisories can come and go according to the diligence level of the examiner. A suspension bush advisory appeared in 2013 for my Audi, disappeared for two years, then reappeared in 2016. I finally decided to have its roll bar drop link bushes replaced last year when the deterioration rattle was eventually felt through the steering wheel.
Advisories are a valuable source of income for garages, as perfectionists and those who merely worry a bit tend to have the remedial work done whether necessary or not.
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