I hope head gasket is still ok yet I will resort to top overhaul before getting a cracked aluminum head. maybe sa engine troubleshooting dpat Ito ipost hehehe , dami na rin kalawang cgru ( I was not able to drain coolant from the engine block) nito because last time change coolant April 2009 , 30/70 ang ratio ng rust to water/coolant pipit pati mga radiator hoses me lagitnit na. I noticed also that after a Long drive more than 60 km, I will adjust again idling speed for nag aadjust ata Ecu to lower performance to reduce possible engine failure.