 I've been a member of the BMWCCA for more than ten years now. This is my 7th three series. M package, rear wheel drive manual 6speed, Power Kit so 320 HP.Noticed and felt engine noise since 68k miles. thought it might be the flywheel and clutch. Replaced at $3,000. Not the issueDealership did a compression test, said it needs a new engine. $18,000! BMW will cover 50% because it's out of warranty. I provided all oil change docs. BMW wanted to see oil changes at least every 15k. I averaged every 7,500 miles. Never auto crossed or tracked. Commuter car, 42 year old father of four. Not laying down patches or beating on the car.My take, don't buy a turbo model. Too much stress on the engine components. Never own one of these out of warranty, you're asking for trouble. Fuel pump was replaced under warranty (common issue), water pump was on  my dime. Hardly reliable, worst car I've ever owned. Beast on the highway? at 4.3 0-60 yes. Sad to say it, I'm a Bimmer guy through and through but that's it for me. BMW corporate said they wouldn't make a repair coverage decision until they knew for sure what the problem was. I wanted the dealership to drop the oil pan to definitively diagnose the issue  so I could tell BMW NA what was wrong. After the compression test all of a sudden the dealership clammed up like it was a cover up? The dealership would not go any further. They told the manufacturer that it needed a new engine without ever dropping the oil pan and taking a peek. Didn't make sense. I still want to have an independent garage take a look so maybe I can get some video or pics and post them. Forget about BMW customer service. I got someone on the line outsourced from India. If you must buy a BMW again never own one out of warranty! Unless your buying a fixer upper for a couple of grand. I traded it in on a new Silverado burying the negative equity of the Bimmer into the truck payment. Tough pill to swollow Good luck!