Anything related to oil causes world-wide problems, but Here's another thread with good information that might help you.

If you read the tech tips linked in the thread by another bolter here , and here, I think you will be able to answer your questions. Like Tiny says, opinions vary from the subjectivity of the subject, but those are two outstanding tech tips either way.

Hope it helps!

(another) Brad


Wrench Fetcher, PhD