dunno if anyone can help me or knows a reliable, cheap mechanic, i just topped up my oil in my fiat punto sport 1.2 16v, using 5w 40 full synthetic as recommended by halfords, since the change, my car has started shuddering when idle and soundin like a tractor, it also seems to have lost some power... if any one knows why please help
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And as valleyveteran said have you overfilled it?