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Unread 09-14-2013, 11:55 PM   #16
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 14,545
No, it is nothing more then squirting a little oil into the cylinder when you do the compression test if your numbers are low and seeing if they come up. It tells you if the rings are bad.

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