is my engine interference OR NON-interference??BMW (01/2001, 530i, e39,m54)

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car was bought new then given to me,nothing has been altered. Early morning car started then died after a few seconds (engine sounded normal),I tried to start again but this time sounded like when getting a compression test(sound like plugs removed). One BMW dealer tells me engine is NON-interference and the other dealer tells me it's interference. Please tell me for sure as I can afford repairs if non-interference(possibly do repair myself).IF DUAL VANOS operation failed w/no valve damage(non-interference),would engine quit start&sound like escaping compression,as vanos controls camshaft position????. Thank you very much and pray valves weren't damaged and I don't have to remove head to get completely machined. VIN: wbadt6343icf05573