Thanks for your research Rich, That's a good write-up on compression testing. One might conclude from that reading that too much emphasis is often put on the results of compression testing and that proper (valid) compression testing is not often accomplished. Much can be learned about the condition of an engine from studying the results of a valid test, but inaccurate diagnostics are more commonly the main outcome. My recommendation is to avoid such a test unless you have strong evidence of a problem that can be easily identified by a test. If the engine runs well and performs properly, don't do the testing. You might see results that will cause you undue worries. Marshall Goodknight, engine failure analyst Please note: message attached From: "Rich Barber" <c300@xxxxxxx> To: "'Michael Moore'" <mmoore8425@xxxxxxx>, "'300'" <Chrysler300@xxxxxxxxxxxxxxx> Subject: RE: [Chrysler300] Compression pressure , 300H Date: Thu, 8 Nov 2012 22:47:28 -0800 ____________________________________________________________ 7 foods KILL fat Surprising foods that boost your metabolism http://thirdpartyoffers.juno.com/TGL3131/509cecd8afe166cd830d0st03duc [Non-text portions of this message have been removed] ------------------------------------ To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx To unsubscribe from this group, send an email to bob@xxxxxxxxxxxxx or go to http://autos.groups.yahoo.com/group/Chrysler300/join and select the "Leave Group" button For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm For archives go to http://www.forwardlook.net/300-archive/search.htm#querylangYahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Chrysler300/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/Chrysler300/join (Yahoo! ID required) <*> To change settings via email: Chrysler300-digest@xxxxxxxxxxxxxxx Chrysler300-fullfeatured@xxxxxxxxxxxxxxx <*> To unsubscribe from this group, send an email to: Chrysler300-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/