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The sticker on my 2000 3.0 says 5w30, they might have changed it to 5w20 in the 3.0 in a later year.
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Ford did change the recommended oil weight in later years because my 02' Ranger 3.0 V6 was listed as taking 5W 20. I also had an 04 Ranger 4.0L V6 4*4 that, I believe, also took 5W20.
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Whats the difference between 5w20 and 5w30, i know ones heavier/lighter,
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I believe the 5w20 is lighter, and newer vehicles run more environmentally friendly on lighter weight oil. However, putting in a slightly heavier oil, such as 5W30 won't necessarily harm your engine -- mostly gas mileage and minimal (at that) is affected.