UPDATE: Sludged Cobalt

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That Castrol GTX is priced higher then Pennzoil Conventional/PYB. Monthly oil changes with what your using now is fine for a clean up and price point.
 
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Because the engine was/is so sludged up your timing chain tensioner is probably not working too good,i'm sure the bore and piston would be sticking.There is an updated tensioner available.My un abused Cobalt started to make noises on startup and the new tensioner cured the problem.They are cheap and may help.
 
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