Looing oil pressure
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If you've got the 4.7, they are notorious for getting gummed up with sludge over time, causing oil not getting up where it needs to be. Drop the pan and have a look/see. Clean it out good and then a little Sea Foam treatment should do the trick.
MMStar23 had the issue and has quite the lengthy thread in this section detailing it and his fix a few months back. Do a search - good reading...
MMStar23 had the issue and has quite the lengthy thread in this section detailing it and his fix a few months back. Do a search - good reading...