Ok I ll try seafoam but someone is telling me to put 20w50 oil it will gueit it down since it has 150k miles I'm not sure if it's a good idea to run 20w50 what do u think
Hi i have a 2001 GMC Yukon Denali 6.0 its been ticking at idle only low rpm Higher RPM not noticeable what could be the problem oil always changed on i tried 5W30 oil and 10w40 SYNTHTIC BLEND oil with no change does anyone in here have same problem
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