I have a 2006 BMW X5 that I purchased new and now has 52,000 miles on it. I received an offer in the mail from a repair shop that specializes in BMW and other European cars, to receive a free “autologic” check of my X5. There was no check engine light or any indication that something was wrong, I just wanted to see if they could find something wrong and I made an appointment for the car. I returned 3 hours later and was told that the engine had negative crankcase pressure and that they would have to “dig into it a little more” and wanted to keep it overnight as it may mean bad valves. The cost would be $400.00 for removing the intake manifold and if any valves were bad it would cost up to $4000.00 more to repair the valves. I left the car overnight and went home and checked with a couple of friends that have some car knowledge and then I called another repair shop, told them what was going on and asked them for their opinion. The second shop told me that 95% of BMWs operate with negative crank case pressure. The next morning I went back to the first shop, told them not to do anymore work and took my car home. Was the second repair shop correct? The car is running fine.