MotorEasy founder, Duncan McClure Fisher, said: "Garage mechanics are among the worst around for using phrases and terms that may make sense to them and may even be technically correct, but which mean nothing to the casual car owner.
"While some garage customers may be bold enough to ask for an explanation, the majority are very British about it and will simply accept what they’re being told, trusting that the technician knows best.
"The problem is that this trust is open to abuse and unscrupulous garages could even use jargon to deliberately confuse their customers and even get them to part with more cash unnecessarily."