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Ok guys this one has me stumped a little.
I'm using coolent. Around 1 to 1 1/2 liters per 5000k.
So I can see no signs of leaks. It runs fine, no white smoke etc.
And to really throw you off it drains the over flow first dry, and there are no bubbles present in the radiator when running.
I have a new radiator cap on it also.
So experts. What am I looking for?? Its got me stumped.