just bought truck, enigne light came on after driveing a couple days guy put full synthetic in the truck recently and now it idles a little rough when i start it and oil is over full by a little bit on dipstick all power seems there not sure temp guage runs colder then normal as well guy said he put something in the truck to make it do that but ive never heard of a truck running colder.
 
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Ask Your Question2000 Chevrolet Silverado 1500
Question: Does over full oil on dipstick cause engine light and rough idle when start cold
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