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I have 5W-40 T-6 in it now for the winter, and will switch back to 15W-40 Premium Blue fo the summer. I have already some Delo 400 5W-40 syn for next winter, I also only use Ford filters and change my oil between 4000-5000 khm at the most.
Does Shell Rotella 15w40 meet the ford 6.4 specs ??
I haven't checked my manual yet as I've just purchased.
I've ran the Rotella in my 7.3 for 14 yrs with zero problems
Rezvani's Latest Post-Apocalytic 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.