hi im a newbie here, to all sifus, im driving perdana evo 3, one month ago , i just changed the head gasket and the o ring, but yesterday after i reach jb from seremban, i noticed the the gasket sealer melted and black oil leaked, i never boost on the highway, was just cruising 100 - 120kmh , can anyone let me know what can be the problem , and its evo 3 standard engine. thx