July 19, 2011A few days ago I realised my 156 selespeed was losing a bit of power, juddering and giving a slight backfire every now and then. It has also started smoking a little more than usual. This morning I checked the oil filler cap and yes there was mayonnaise in it. My assumption is that the head gasket is gone. Does anyone know what the cost of replacing a head gasket is like?
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