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It takes a little under 5 quarts, with a filter change.
You're supposed to run 5W-30; the guy I got my truck from didn't know that and ran Mobil1 10w-30. I'm starting to get some valve noise now that it's getting colder, and if I try to run 5w-30, it sounds like a machine gun.
If it was my truck, I'd try 5w-30, but I'd also be prepared to switch it out for the thicker stuff if it makes too much noise.
I've ran 10W-30 before and it quieted the upstairs of my motor down, but made more noise on a cold start. I think I am going back to 10W-30 because my engine sounds like a freakin' diesel. At only 86K.
I would stick with the recommended weight. YOu can add an oil treatment such as Lucas if you are getting noise. Worked great in my 88 Jeep. Engine sounded like a tank before the treatment.