In previous cars I've always drained the pump as the reservoir method always seemed terribly lacking. I've read that the fluid really never needs changing unless there was a leak or dirt was introduced or some components were replaced, etc. and in those cases changing out the reservoir (with integrated filter) was recommended. Cost is around $40 or so for the filter which is cheaper than some other BMW filters.
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Originally Posted by JCL
Do you replace the reservoir to get to the non-removable filter? Seems like that may be overkill. I would look to changing the filter if I had a component failure that put metal in the system.
If one wanted to do a more complete job than using a syringe to change only the small amount of fluid in the reservoir, I think the best would probably be to drain the pump at the same time. If doing just the reservoir, I would think it would take a lot more than 2 cycles to change a significant portion of the fluid.
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