It looks like the "Scott's versus others" argument was discussed a year or two ago on the WERA forums. A couple people claim that the air bubble gets emulsified in the oil almost immediately, and of course others argue that point. I found it to be an interesting discussion, though.

There's also general damper theory and recommendations in the thread, worth a read IMHO.

http://forums.13x.com/showthread.php?threadid=5884