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Discussion Starter #1
Did the 07 3.5L come with plastic valve covers? The reason I ask is both 06's I own/have owned have the cast aluminum covers.

the reason I ask is because I know they made changes to the 08-10 engines including plastic covers, and there is yellow paint pen on the intake, like when you buy something from the wrecking yard.

I am thinking maybe a head gasket has been changed, the coolant is very new, the oil is clean and uncontaminated and yet there is a little white sludge inside the oil filler cap. I am going to take a look inside with my camera
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