Hi, I had a 99 grand voyager that had those symptoms... In my case was head gasket, the water was pushed into the manifold exhaust and eventually evaporated into the exhaust, I was putting 2 litres every few days. Plus oil in the expansion tank is a sign of head gasket failure. You can try this: http://www.ebay.co.uk/itm/like/272810410924?chn=ps&dispItem=1&adgroupid=43333907642&rlsatarget=pla-299844085363&abcId=1088846&adtype=pla&merchantid=101725210&poi=&googleloc=9045715&device=m&campaignid=805983114&crdt=0&ul_ref=http%253A%252F%252Frover.ebay.com%252Frover%252F1%252F710-134428-41853-0%252F2%253Fmpre%253Dhttp%25253A%25252F%25252Fwww.ebay.co.uk%25252Fitm%25252Flike%25252F272810410924%25253Fchn%25253Dps%252526dispItem%25253D1%2526itemid%253D272810410924%2526targetid%253D299844085363%2526device%253Dm%2526adtype%253Dpla%2526googleloc%253D9045715%2526poi%253D%2526campaignid%253D805983114%2526adgroupid%253D43333907642%2526rlsatarget%253Dpla-299844085363%2526abcId%253D1088846%2526merchantid%253D101725210%2526gclid%253DCjwKCAjwlrnNBRBMEiwApKU4POCzoW_-yhyzUGAxuvFaXuDGZYjlNbfcr0GY6NFWPlUxT7uI9eT_cxoCLAMQAvD_BwE%2526srcrot%253D710-134428-41853-0%2526rvr_id%253D1301841868549 It worked on a Peugeot that I have and was throwing oil out in the engine bay. Otherwise, find a different mechanic and do a gasket test, eventually a replacement. Hope it helps.