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    Let's get to the bottom of the TBN issue

    Everyone seems to be noticing major differences in TBN values over the past few months. The information posted on this site indicates that most of the labs have switched over to a "new" method for determining TBN. Can anyone from a testing lab comment on what is really going on? How were/are the...
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    Oil Analysis Indicates a Mechanical Problem: Now What?

    I just got the second bad oil analysis result on my Toyota 4-Runner 3.4L V6. Copper suddenly went through the roof and seems to have stayed that way. You can view the last 3 analyses here: http://unr.edu/homepage/weber/toyotauoa.htm The engine has been run on 5W-30 M1 since 1.5K and changed...
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