Transfer case lubricant: SAE 80/90W GL 5 Gear Oil (2,4l)
Now my questions:
1- What is the difference between GL 4 and GL5 - Is it the viscosity????? Is 4 less thicker than 5?
2. Your tables recommend GL 4 for Gearbox and Transfer case but GL 5 for Differentials - What is your personal opinion and why?
3. What will you recommend based on experience for (1)Engine, (2)transmission, (3)tranfer case & (4)Differentials: Brand and Spec please!!
My drive style is very calm and a lot of times in the bush at idling speeds (Game viewing and photography) and on tar I never exceed 4000 rpm's but will average a drive speed of 110 - 115 km/h, with the revs close to 3000rpm. Once every 2nd month I'll play along with some friends @ 4x4 venues and use everything the Pajero can deliver. (Within save parameters - I need the vehicle during the week so I can't risk unnecessary breakdowns)
as far as I remember some gl-5 oils are bad for the syncros (yellow metals) due to the high sulphur content so some fear degradation of the syncros on gl-5.
I would trust Mitsu's spec over Haynes' spec and use gl-4 in tranny and transfer and gl-5 in both diffs with the friction modifier added in the rear diff (about R56 from mitsu).
Also note that the VCU in the transfer is dependent on the right spec and viscosity oil.
While both are gear oils and are available in many different viscosity grades, the difference between GL-4 and GL-5 oils is that the latter are designed for situations where a large percentage of sliding occurs at the contact interfaces under high contact pressures (such as in hypoid or amboid gear sets commonly found in differentials' crown wheel and pinion sets).
These days there are GL-5 oils that are compatible with yellow metals and can be used in the gearbox, but just make sure on the specific oil before using it.
The viscous coupler in the transfer case is a sealed unit and therefore does not depend on the lubricant used in the transfer case for correct operation (unlike the friction plates in the limited slip section of the rear diff in Pajeros so equipped).
Gerrit Loubser
2003 Toyota Land Cruiser 100 VX TD
2003 Mitsubishi Pajero 3.2 DiD LWB A/T Gone & missed
Firstly TNX to all the comments and info!
OIL is a bigger subject than one initially thinks!
Feedback to what I did.
I am a Castrol believer so I went the Castrol route: Engine: Castrol Magnatec Transmission & Transfer Case: Castrol 402 – SAE 75W-85 GL-4 (Fully synthetic Transmission Fluid) COSTLY – but in my opinion simply the best. Differential: (Front and Rear): LSX SAE 90 API GL-5 – It’s an extreme pressure Mineral Gear oil for final drives. (LSX – For Limited slip rear axles)
My transmission never gave me any problems but I do experience a difference in gear change – very smooth, excellent!
Cheers all