Paul Philpot Posted May 6, 2018 Share Posted May 6, 2018 Car is 1.4 K series. 42,000 miles. White mayo in expansion tank. No loss of power, oil looks perfect (level and colour). Serviced 500 miles ago. Uses about 250ml of water every 500 miles.Any ideas?Paul Link to comment Share on other sites More sharing options...
K7 VCT Posted May 6, 2018 Share Posted May 6, 2018 Start of Head gasket failure by the sounds of it. ☹ Link to comment Share on other sites More sharing options...
oilyhands Posted May 6, 2018 Share Posted May 6, 2018 It’s unusual to see oil in the coolant without also seeing coolant in the oil when suffering HGF. How old is the car/engine? Are you sure it is mayo?Oily Link to comment Share on other sites More sharing options...
Paul Philpot Posted May 6, 2018 Author Share Posted May 6, 2018 1994 42,000 miles. Mayo? White gunk. Link to comment Share on other sites More sharing options...
K7 VCT Posted May 6, 2018 Share Posted May 6, 2018 Oil pressure is higher than coolant pressure ? Link to comment Share on other sites More sharing options...
Leadership Team SLR No.77 Posted May 6, 2018 Leadership Team Share Posted May 6, 2018 Expansion tank or catch tank? Link to comment Share on other sites More sharing options...
Paul Philpot Posted May 6, 2018 Author Share Posted May 6, 2018 Expansion tank. Link to comment Share on other sites More sharing options...
oilyhands Posted May 6, 2018 Share Posted May 6, 2018 There are very few places where an oilway is close to the coolant jacket, just one in fact, Very early engines with plastic dowels and older style gaskets have a weakness at the front dowel which houses the only oilway at the level of the cylinder head, it is likely that the oil has leeched past the plastic dowel and breached the coolant seal, on post 98 engines this is not possible as the gasket design changed. Hence my question about the engines age. It is highly likely that this is the mode of failure.Oily Link to comment Share on other sites More sharing options...
Paul Philpot Posted May 6, 2018 Author Share Posted May 6, 2018 So... New head gasket it is. Link to comment Share on other sites More sharing options...
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