[bmwhitman]

I have 93,000 km on my E90. I am planning to get an automatic fluid change. I've read that at high mileage it is not recommended to get a change since certain gunk might dislodged causing issues with the transmission. Is there any truth to that?

Also, how many litres of ATF fluid do I need? The dealer is quoting about $31 per litre but they don't have pre-packaged bottles like engine oil. They suggested I bring a large container to hold it.

How often should I the tranny fluid once I start changing the "lifetime" fluid?