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I am guessing the 3.8l uses a timing chain ? If so , is it a problem child ? Or the gears , guides , follower , tensioner , cam phasesers , cams ?

I am guessing one thing I can do to " be kind " to these parts is to do frequent oil / filter changes with quality oil / filters ?

Do not think the 2006 is specified for Dexos oil . Since June 2017 , I have done only one oil change ( 3000 miles ) with Mobil conventional oil and Fram PH 3387A filter .

I have several gallons of conventional oil on hand . Will probably use it in the Buick . When that is gone , I may go to Dexos full synthetic . Which is what I am running in our 2016 Chevy Sonic 1.8l automatic .

Wyr
God bless
 
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