Just wanted to add my recent experience with oil separator issues on our 2005 3.0 Sport. Last summer at around the 70k mark, we got an oil level low warning. Took it into BMW of Morristown where the CCV was replaced under the CPO warranty. Fast forward to 2 weeks ago when the oil level warning came back on again. Checked oil level on the dipstick and it was several quarts low. More tellingly, there was peanut butter sludge buildup on the inside of the filler cap.

Back to BMW of Morristown where they now claim that 2-3 qts of consumption is normal. Despite my assertion that that level of consumption is not normal and description of the sludge, they proceeded to brush off my concerns and simply filled it with oil (overfilled to be correct). It was obvious that BMW of Morristown could no longer be trusted so I took the vehicle to Circle BMW in Eatontown, NJ almost 1hr away. My service advisor Tim Meritzis actually listened to the symptoms and had the techs run a pressure test that indicated imminent failure or failure. The CCV and updated hoses were replaced under CPO. He didn't even charge me the $50 CPO co-pay as this was a redo of work improperly performed by BMW of Morristown. It pays to have a good dealer and service adviser that won't blow you off and will take the time and effort to diagnose the issues properly.

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'90 E30 M3
'05 X5/3.0 Sport (E53)
'03 540i/6 M-Sport (E39)
'91 325i/5 Sport Package (E30)
BMWCCA #360858 SCCA# 374179