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Message: <blockquote data-quote="jarance" data-source="post: 380875" data-attributes="member: 21">Actually, the radiator does have a hairline crack based on the earlier picture posted. I have try to seal it with epoxy glue to stop the leak but still loosing water. I did not realize that was another leak from the top hose. Anyway to cut the story short, I decide to change the radiator. In the course of changing the radiator, I found the leak on the top hose. The leak was at the bottom section of the hose. it was discover after the hose was removed. Maybe the repair was good but I am not sure. I think it is better not to take any risk incase of overheating problem due to rapid loss of coolant. pertaining to the coolant, I think the previous owner still use the original coolant from day one from AB based on the accumulation of the aluminum oxide as pointed out by you.I have use pure water now without any coolant. Temperature still mid way mark same as with coolant.Maybe I will consider to add the correct coolant if the water level do NOT drop.So AB, what the correct type of coolant for M54 engine?</blockquote>