Wondering why the car acted like the transmission was slipping? on 2007 BMW 335xi

Have had the 535xi for 3 months and love it. No issues. 2 days ago i headed up a relatively steep paved hill at about 25 mph when the car started to vibrate. It felt like the transmission was slipping in and out. Lasted for 20 seconds. I am not sure how to check the transmission oil level as yet so if you can tell me THANK YOU. Appreciate the help.

by in Bellingham, WA on January 28, 2012
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