There is no leaks and the engine has great compression. I change the oil every 6000 miles, and the engine oil looks good (no coolant mixture in it) and the engine oil level stays the same througout the 6000 miles. The thing is, i have to refill my coolant bottle like once every 3000 miles. It just goes down very slowly. I have no clue why its going down like that. the engine is in perfect condition too.
i think somebody was experiencing the same thing because he was running a test pipe like i was. does running a test pipe instead of a cat cause your coolant to dissapear slowly, and if so why?

 

Maybe a very small leak in the radiator or around a hose clamp or even in the heater core ?

 

well.. im using a normal civic radiator with a smaller inlet/outlet diameter and using a hose clamp to clam it down.. but i dont think it's leaking though. n e body else?

 

check your radiator cap. it may not be holding pressure and causing your coolant to boil and evaporate. you do not have to be overheating to be experiencing this. I saw this happen today at work to a Camero