Best weight oil for f250?

NightRide

Roll Racer
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Just an update switched to the 5w20 amsoil sig series and filter. Mpg on the highway jumped up from 12.3 to 13.5, wonder if i could squeeze it up to 14 with an AiRaid cai.
 

black99lightnin

move along
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Louisiana
Just an update switched to the 5w20 amsoil sig series and filter. Mpg on the highway jumped up from 12.3 to 13.5, wonder if i could squeeze it up to 14 with an AiRaid cai.

Interesting. We're due for our first oil change, the dealership is giving us a free one. I'll try the 5/20 on next go around.
 

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