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Since I just changed the coolant in my Legend, this subject is fresh in my mind. There was a letter and response in Motorcycle Consumer News concerning bike coolant.
The letter read: "Is it really necessary to use a 'silicate-free' antifreeze in my bike?".
The response was: "Yes, you need to use the proper antifreeze. The problem is that silicate is an insoluble metal salt that can destroy the bearings in the water pump. Other types of antifreeze build up deposits in the cooling passages, and several types attack the aluminum over time. Take the factory's word for what you should use.".
I used Prestone 5/150, which is phosphate- and silicate-free, and safe for aluminum engines. Just thought I'd pass this along.
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