Transfer Case Oil - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 2 (permalink) Old 03-24-2018, 10:02 AM Thread Starter
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Transfer Case Oil

Thinking it's time to change out transfer case oil and saw a recent vid saying to use the Ford XL-12 Transfer Case oil, not the Mercon ATF originally specified. It also mentioned to change every 40k miles rather than the 60K written in the manual.

Just curious if anyone has used anything else with good or bad results. I believe the XL-12 is a full synthetic so I may stick with it.

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Bill

2006 SD250CC 4WD Lariat, CAT Delete, Coolant Filter, Fuel Crossover, SCT TSX with EGT sensor, ARP Studded, Custom Flow tailgate, Autometer FPG, Bulley Dog bed steps, '08 diff cover with Amsoil 75w140, Blue spring mod, Stempede hood shield, PCV mod, full EGR cooler removal/delete, Rhino bed liner, tunes, Rotella ELC, Doodad mod, Archoil AR6200 with 2-stroke, 185A Alternator, FS F2400 airbags, SumoSprings front axle, 6.4 Trany pan and filter.
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post #2 of 2 (permalink) Old 03-24-2018, 01:06 PM
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I have used Royal Purple SynchroMax for the last 140k miles.

Working great.

Mark
06 F250 CC SB FX4 Lariat;ARP studs;OEM gaskets;Banks exhaust;DynaTrac Ball joints;Coolant filter;High-Idle mod;RACCCV6000;JimmiJammers;Ravelco;SynchroMax xfer case;Fumoto valve;Harpooned;CPOhighwayProducts toolbox;tracrac;Fox Weatherboots;Wet Okole Seat Covers;BriteBox;Re-flashed;Quadzilla Recon XZT Fuel Press;Blue FPR spring;DashDAQ;PHP FICM;RiffRaff boots;DCPower270AXP;PowerInverter;Rancho7000's;BPD EGR cooler;One-piece HPOP fitting;D-plugs&standpipes;BPD BilletWaterPump;SCT w/ Matts SRL+;ELC Ultra;DuraTracs
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