Please help ML320.
 

Hi,
I recently bought a 2001 ML320, yesterday when i was driving, all of sudden it started noise from air filter box, it was kind a high air pressure in air filter box and in other hoses connected to it. it was so loud i stopped car a side and turned engine off, even though it was making this noise for about 4 to 5 mins. then it stopped, agin it started and stopped automatically 3 times in my next 20 mins drive to home. I have also noticedlittle oil dripping from some where in my engine. can any one has knowledge what this could be? has anyone any idea what this could be and how much coast i have to bear to repair this? please help???????????????? Thanks