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chris13
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i have just had an oil and filter change on my car at a BMW dealership. they left the filter housing and the air duct off, therefore allowing unfiltered air into my engine,  i didnt discover this until i had driven 530 miles could it have caused engine damage

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Morning Chris 

Wow that doesn't inspire confidence in that Dealer what has their service manager had to say? I would write to him email or post so that should there be an issue later you have some evidence.

When you say the air duct was left off was it on the left of the engine ? The main filter is at the back of the engine bay with a feed to the intake on the right (passenger side).  Anything left off on that side and I would have thought increased engine/intake noise would be obvious. After 500 odd miles I wouldn't think any serious damage has been done as our environment generally is pretty clean so the opportunity for your engine to swallow anything harmful will have been quite small.

Fingers crossed 

Dave 

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