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Originally Posted by mohaughn It's the same as the engine oil. You would change it when you change the oil in the engine. BMW thinks that you can go 12k miles on a single oil change, but I would never do that. And before the next question gets asked, you would change the intercooler fluid each time you change the fluid in your radiator. |
10k on synthetic fluid is perfectly acceptable. I've been changing my fluid every 10k miles with a filter change every 5k, had my oil tested and everything was hunky dory.