With the oil cap removed you can what looks like a plate or a shield just inside the engine (3.4L) . There is some build up on top of it but what I can see beneath it appears clean (the little that can be seen). Does is this normal? Has oil just settled on top of that shield and “cooked” so to speak over the years. The truck runs strong, does not use oil, smoke, or sound in anyway different from new. I change my oil every 3-5,000 miles depending on how far I drive in three months and I use mobile 1 5w-30. I have had the truck since 10/07 when it had 75,000 miles and now it has 108,000. I do not drive it hard or abuse it. I am probably just paranoid but I want to get the most out of this truck. Thanks for the advice.