Quote:
Originally Posted by fromwrxto330ci
BMW High Performance Full Synthetic 5W30 every 5k miles
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Linking this to other engine sounds and the oil used, I'm sensing some posters are thinking it is something more sinister than the vacuum pump exhausting into the engine cavity.
Our vacuum pumps do exhaust internally. Think about it, if it wasn't into the engine, (remember it is lubricated by engine oil), we'd have a chirping sound track externally. At least with the oil filler cap fitted, there is limited sound to the outside.