Ok, been reading for hours on every thing, and recently signed up. This is a question that I should have asked sooner. I bought a 2004 f350 KR Crew with 28000 on it. Bought from a Ford dealer's used Truck lot. They had just serviced it. After Reading this thread, I went to check which oil they used. Quaker State, get this, 5W-20.

Should I get this out soon? Is this screwing something up?

I appreciate any thoughts.

Sean

 

odds are it not 5-20 thats is most likly a mis input. the truck would not run to well on 5-20. Bit to error on the side of caution I would change to know correct oil

 

5W40 is what you want if running syn. 15W40 for dino.