Maintenance TechThis forum is for discussion of all aspects of maintenance that should be performed on the FJ Cruiser to keep it operating at maximum efficiency.
Well. It looks like not only has Toyota gone to a SYNTHETIC gear oil, but one intended to cover a very wide range of temperatures from extreme cold to very hot
Note that 75W-85 is a very common viscosity range for light duty manual transmissions. It's viscosity is equivalent to the GL-4 SAE 50 spec for heavy duty manual transmissions, and the two are usually interchangeable
A straight SAE 90 is almost impossible to find here in North America, and should *never* be used below -15 C. An SAE 90 is commonly available in many South African nations, the Mid East, India, Australia, Mexico, and many South American and Central American nations
Kind of funny how some of us got flak from the dealership after we mentioned we were using a synthetic gear oil. This makes my decision to use the following gear oil all the much better
When you guys change the diff fluid, do you put the diff clutch pack additive in as well?
The FJ has a true mechanical locking rear end, there is no clutch pack involved. No, do not use LSD additive: not needed, no "benefit," extra cost, etc
The heavy duty synthetic lubes I use specifically do *not* use LSD additive. For many HD trucking axles, the use of such additives is prohibited due to less gear tooth protection, increased spalling, etc
This is the shop manual section on the rear axle. Note the shift fork, and sliding splined collar
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2007 Toyota FJ Cruiser 5AT "C" package, Sun Fusion
2004 Toyota Prius "B" package, Tideland Pearl
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The FJ has a true mechanical locking rear end, there is no clutch pack involved. No, do not use LSD additive: not needed, no "benefit," extra cost, etc
The heavy duty synthetic lubes I use specifically do *not* use LSD additive. For many HD trucking axles, the use of such additives is prohibited due to less gear tooth protection, increased spalling, etc
This is the shop manual section on the rear axle. Note the shift fork, and sliding splined collar
The key here is "synthetic", not just the weight rating change. They most likely decided that the additional protection and temperature reduction provided by synthetic lubricants would help to reduce the occurence of rear diff failures.
I have been using and recommending Redline synthetc lubricants in vehicles for 20+ years, and have yet to see a lube-related failure in any component in all that time. I changed out my FJC soon after I bought it, and when you look at any component that has been run in sythetic oils for any length of time, you can see the difference.
You'll notice more and more OEMs are using synthetics in their transmissions, differentials, and even their engines. This is no accident - it is better for your vehicle.
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straight weight 90 called out originally in the manual is, as mentioned above, hard to find in the US. And synthetics do provide a more predictable blend of substances than a fractionated petroleum product. So the change seems reasonable on both accounts.
i do feel slightly better, having already made the swap to multivis synthetics anyway.
So the SAE 90 was breakin oil i guess
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Again, please refer to the shop manual section I posted, it applies to both 4x4 and 4x2 versions. What Toyota calls "auto LSD" is - in essence - electronic traction control. Engine torque is modulated and the brake is applied to the spinning wheel
In most light duty applications, the lsd additive shouldn't do any harm. It also has zero benefit. Note that the TSB has separate part numbers for the oil, apparently one oil has the LSD additive and the other does not
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2007 Toyota FJ Cruiser 5AT "C" package, Sun Fusion
2004 Toyota Prius "B" package, Tideland Pearl
2007 Titanium Metallic and YES I wheel it!
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