BlackMDK 0 Report post Posted July 11, 2007 Buying used BMW I decided to buy a BMW so other day I checked two of them out and I’m bit confused with one issue. I usually always remove the oil cap while engine is running but I noticed that when I removed oil cap engine revs drops (this is 320 E36) on one it dropped so significantly that engine almost staled. Is this normal behavior for BMW. Quote Share this post Link to post Share on other sites
Andrew 30 Report post Posted July 11, 2007 Buying used BMW I decided to buy a BMW so other day I checked two of them out and I’m bit confused with one issue. I usually always remove the oil cap while engine is running but I noticed that when I removed oil cap engine revs drops (this is 320 E36) on one it dropped so significantly that engine almost staled. Is this normal behavior for BMW. Yes - it causes a massive vacuum leak. Quote Share this post Link to post Share on other sites
*Glenn* 854 Report post Posted July 12, 2007 Possibly one of the vacuum hoses or the crankcase ventilator valve.....not such a big deal to fix Quote Share this post Link to post Share on other sites
BlackMDK 0 Report post Posted July 12, 2007 Is it white/yellow stuff on oil cap also normal? Quote Share this post Link to post Share on other sites
ducatiss 1 Report post Posted July 17, 2007 (edited) Is it white/yellow stuff on oil cap also normal? No not really - could be a sign of water mixing in with the oil (worst case) or simply excessive condensation from lots of cold running. It does warrant investigation however before purchase. BMW's are plentiful - unless you are on a really tight budget you can take your time looking round and getting the best one. Edited July 17, 2007 by ducatiss Quote Share this post Link to post Share on other sites
