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Message: <blockquote data-quote="David Yong" data-source="post: 227005" data-attributes="member: 3555">For N52 engines (325i), the first service is at 10,000kms and next service on 25,000kms and subsequently at the service interval of every 25,000kms.If you feel the service interval is long, you may just do a engine oil & filter change at every 7,000kms to 10,000kms. Of course you would have to pay for this as it is not cover under the service inclusive program.mnas; I think the hissing sound is normal as my car is having this sound too whenever I turn on the aircond. It is just a small hissing sound for 1 to 2 seconds. Dun worry....TomJB; your case on the clock slow down and sudden change of date is a bit weird. Most probably because of battery. Suggest that you bring it for a check.</blockquote>