Hi, if she's only doing short journeys it could be just condensation in the engine mixing with the oil as the engine is not getting hot enough to evapourate the condensation, the cheapest way to find out if it is a headgasket problem is to take it to a reputal garage and ask them to do a "sniff" test of the expansion tank with the engine running if there is a problem the fluid will turn from blue to yellow
nigel
February 2009