I have had a few requests on this and: Per my Tip # 29 on “Saving Your Automatic Tranmission”, the key is Synthetic oils have a higher boiling point than the mineral oils. I was talking then about Transmax Z, which besides taking harder work and higher temperatures it has what they call more “Surface Tension” meaning it sticks to the material faces under load better. Well it is now on their Website at www.castrol.com.au and click on the “Lube Guide” and go to make and model and such… Castrol are now recommending the Transmax Z for “Heavy Towing”
Which takes you to:
Site Link
It looks like this: (NOTE 134 AT BOTTOM RECOMMENDING TRANSMAX Z)
Commercial Vehicle, Light /Medium &4x4
F-250 4x4, V-8 Turbo Diesel (2001-2006)
FORD
F250 4x4, 7.3 Litre V8 Turbo Diesel (2001-2006)
Crankcase
CASTROL RX SUPER
A SAE 15W-40, API CH-4/SJ mid ash multigrade detergent diesel engine oil specifically designed to suit the requirements of the latest US heavy duty diesel engines. CASTROL TECTION PLUS
A mid ash SAE 15W-40 multigrade diesel engine oil approved for use by all major European heavy duty truck manufacturers. Also suitable for certain Japanese and most US engines. Meets the tough standards of ACEA E5 and Volvo VDS-3 for wear protection, bore polish and oil consumption control. SAE 15W-40, ACEA: E3, E5, B3, MB 228.3, Volvo VDS-2, VDS-3, API CI-4, MAN 3275, Global DHD-1, Mack EO-M Plus, Cummins CES 20071, 72, 76, 77, 78
Service Refill Capacity: 14.2* Litres (See Note 292)
Manual Transmission
CASTROL TQ DEXRON III
Automatic transmission fluid formulated to the Dexron® III specification. Provides enhanced friction durability, wear performance, oxidation resistance and cold temperature fluidity. May be used in all vehicles where Dexron® fluids are recommended.
Service Refill Capacity: 5.5 Litres (See Note 134)
Automatic Transmission
CASTROL TQ DEXRON III
Automatic transmission fluid formulated to the Dexron® III specification. Provides enhanced friction durability, wear performance, oxidation resistance and cold temperature fluidity. May be used in all vehicles where Dexron® fluids are recommended.
Service Refill Capacity: 16.7 Litres (See Note 134, 13)
Differential
CASTROL SAF-XA
Full synthetic rear axle fluid incorporating Castrol's most advanced transmission fluid technology. Engineered to provide protection at the extremes of high and low operating temperatures, it is our prime recommendation for rear axles used in competition, severe duty and long drain applications. Suitable for both limited and non-limited slip rear axles. SAE 75W/140,API GL6
Service Refill Capacity: 3.3 Litres (See Note 15)
Power Steering
CASTROL PS FLUID
A mineral based fluid suitable for most power steering systems where the following specifications are nominated: Dexron®, Dexron® II & Dexron® III, SAE 10W or 10W-20 engine oil, ISO 32 or 46 hydraulic oil, Ford M2C-33 F/G, Ford M2C-138 CJ, Ford M2C-166H, Ford Mercon, Ford SQM-2C-9010A and Mitsubishi Power Steering Fluid.
(See Note 302)
4WD Transfer
CASTROL TQ DEXRON III
Automatic transmission fluid formulated to the Dexron® III specification. Provides enhanced friction durability, wear performance, oxidation resistance and cold temperature fluidity. May be used in all vehicles where Dexron® fluids are recommended.
Service Refill Capacity: 1.9 Litres
4WD Differential
CASTROL SYNTRAX 75W/90
Full synthetic manual transmission, transaxle and rear axle lubricant with outstanding extreme pressure, synchroniser and high temperature performance. Recommended for vehicles that combine gearbox and hypoid differentials, rear axles of light cars and secondary drive axles (front and rear) of 4WD vehicles. SAE 75W/90, API GL5.
Service Refill Capacity: 1.8 Litres (See Note 225)
Notes
* Includes Oil Filter
13 Dry fill capacity shown, fill only to full mark.
15 Rear differential.
134 For heavy duty or towing applications use CASTROL TRANSMAX Z.
225 Manufacturer recommends a 75W-90 gear oil meeting Ford Spec. No. WSP-M2C201A.
292 May also use CASTROL ENDURON S.
302 May also use CASTROL TRANSMAX M, CASTROL TQF or CASTROL TQ DEXRON III.
