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What kind of driving are you doing? Towing, high rpm high speed or just short trip city driving?
If you are driving unloaded short trips I would leave it in.. The Motor craft 5W20 is not much lighter than the 5W30 and if the oil doesnot get hot it will not thin out to the spec.
I just changed the oil in my 99 Ranger with the 2.5L four on Tuesday evening after driving home 80 miles at 60-65mph. Outside temps were about 65 F.
The oil was not hot at all!! just warm, I wash my hands in alot warmer water than the oil was.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.