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Message: [QUOTE="superduty4x4, post: 1526215, member: 542"] I did try to do a search, but there are so many threads with oil in the topic that are not what I was trying to figure out or completely unrelated I figured I'd just make a new post. You said basically what I was thinking already, the 5w40 oil is probably going to help more than an additive at this point. I may give it a go on this oil change and see how it goes, I can always add some Archoil or Rev-X later if needed. My concern with running an additive right now is (1) there aren't any issues with the truck which would warrant trying the additive, and (2) if I do put some in (along wit the switch to synthetic oil) it may knock some of the 14 years worth of crud out of the system and cause issues. I've only had this truck for about a year now, and while it is in good shape and appears to be cared for fairly well, it did have a host of issues when I bought it that I had to sort out (failing FICM, green coolant, clogged oil cooler). So, if I were to venture a guess I'd say whoever owned it previously probably did the basic recommended maintenance and not much more. I highly doubt if it's ever had synthetic oil or an additive in it. [/QUOTE]

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