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I would change the coolant every three years (archive)
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Posted by Howard on October 07, 2001 at 20:48:19:

In Reply to: 97 740il Coolant Change/Flush posted by BigDeal on October 07, 2001 at 20:00:56:

My car is getting both water pumps replaced at 72K miles. I would definately not go more than three years on this important preventative maintenance task. I would think that a good quality antifreeze that is safe for aluminum should be fine. The transmission is a sealed unit, and no fluid changes are necessary for the life of the transmission. $40 dollar per gallon dealer antifreeze is available for service that requires replacing lost fluid, such as leaking hoses, water pumps, radiators, coolant reservoirs, engine rebuilds and replacements, etc. and is a profit item for the dealer.

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