my driving is like less then 15 min per trip each way to work and all city driving about 60km/h .this is why I went with catch can .I`m experimenting with it and see how it goes. I just didn`t like the idea of there being a hose hooked up to the dipstick tube which allows a ton of oil into your intake if the ccv fails like it did to me this winter. (hydro-locked my engine and had about 1 liter of oil left in it,not good,glad I noticed oil smell in the house in time and ran out and shut down the x5). just got back from a 6 hr trip the day before this happened ,so I didn`t get stranded, it was idling in driveway.

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2003 bmw x5 3.0i ,219000km build date 2003-08-18