What oil for F-350 transmission?

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Mobil Australia gives MOBIL 1 SYNTHETIC ATF or MOBIL MULTIPURPOSE ATF Service Refill Capacity: 16.7 Litres (see note 13) You may want to check whether that applies to the USA...
 
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785
Location
Western Washington
Yep, you have the high torque ZF. Pretty much any Mercon V will work fine in that transmission. I would use RedLine's High Temp ATF for it's slight increase in viscosity and ability to withstand quite a bit of heat. If you don't tow or tow light any ATF will do, remember to change it "often" as there is no filter and the ZF 5 speeds run hotter due to no external oil cooler unlike the newer ZF 6 speeds.
 
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