Quote:
Originally Posted by m6pwr
If anything sludge is usually a result of severe oxidation of the oil caused by very high heat. You mentioned a lot of cold wx ops. Sludge, I believe, rarely occurs in today's synthetics.
If you're really concerned about BMW's oil change interval, you could start to do used oil analysis. For folks new to the process, Blackstone is a good start because they try to interpret the results for the owner http://www.blackstone-labs.com/. I'm not a big fan of their commentary, but they are a start. Small books have been written on how to interpret uoa results.
Or, you could read this thread about BMW's oci's in Europe - - and relax.
http://f30.bimmerpost.com/forums/sho...d.php?t=894011
Do not do 5000 mi oil changes. A total waste and totally counterproductive.
http://papers.sae.org/2007-01-4133/ |
Would 7,000 miles be more reasonable?