Spark plugs should be changed at the main 4/5 60K service,but although they are meant to last that long, it is often something that self DIYers change more often, as it can make a difference to performance
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*All mechanical suggestions and tips are purely for information only. I accept no responsibility for any damage to vehicles or persons as a result of any of my information. Consult a MG-Rover manual before attempting any repairs. Some repairs should be carried out by professionals only.