Spot checks on 91 garages by motoring organisation ANWB has revealed that many mechanics charge for parts or fuel they have not used during major services.
Other common oversights include a failure to change the brake fluid and oil filters, refill the coolants and adjust headlights.
The ANWB gave garages an average score of 6.4 out of 10, up from 5.6 in 2005.
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