What Oil Does a 79 Series Gearbox Take?

Quick Answer: Toyota Landcruiser 79 Series gearbox oil specification depends on whether the vehicle has a manual or automatic transmission. Manual gearbox (R151F, R150F, R155F across the V8 and 2.8L era): GL-4 75W-90 gear oil, capacity approximately 4.5 L. Automatic transmission (factory 6-speed auto on 2.8L from late 2024, optional on earlier V8): Toyota WS automatic transmission fluid, capacity approximately 6.5 L total system. Manual transfer case across all variants: GL-4 75W-90, capacity approximately 2.2 L. Service interval typically 80,000 km in normal service or 40,000 km in severe service.

Getting the right gearbox oil into the 79 Series matters because the wrong fluid degrades synchromesh on manuals and shift quality on autos. The specification varies by transmission type and year. This guide covers what to use for each.

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1. Manual Gearbox Oil (R151F, R150F, R155F)

The manual transmissions across the V8 era (2007 to late 2024) and the new 2.8L variants use API GL-4 gear oil in 75W-90 viscosity. Capacity approximately 4.5 litres. Toyota Genuine LV MTF, Penrite Pro Gear, Castrol Manual EP all meet the GL-4 75W-90 specification. Some workshops mistakenly use GL-5 oil which contains higher sulphur additives - GL-5 attacks the yellow-metal synchros on the Toyota gearbox.

2. Automatic Transmission Fluid

The factory 6-speed auto on the new 2.8L 79 Series (and the AB60F if fitted via conversion) uses Toyota WS (World Standard) automatic transmission fluid. Capacity approximately 6.5 L total system; refill (without rebuild) typically 4 L. Toyota Genuine WS, Penrite ATF Multi-Vehicle (Toyota WS spec) and Castrol Transmax WS all meet specification.

3. Transfer Case Oil

Manual transfer case (VF1A, VF2A across the V8 and 2.8L era): API GL-4 75W-90 gear oil, capacity approximately 2.2 L. Same specification as the manual gearbox. Some severe-service applications use synthetic 75W-90 for better thermal stability under heavy use.

4. Service Interval

Toyota recommends 80,000 km in normal service for gearbox and transfer case oil. In severe service (heavy towing, sustained off-road, dusty conditions), halve to 40,000 km. Inspect oil at every major service - dark or sludgy oil suggests overdue change or water contamination from off-road water crossings.

5. Common Mistakes to Avoid

Do not use GL-5 oil in a 70 Series manual gearbox - attacks the synchromesh. Do not use Dexron III ATF in the 79 auto - it is not Toyota WS spec and damages the shift control system. Do not use engine oil in a gearbox - completely wrong additive package. Always confirm against the owner's manual for your specific year before topping up or refilling.

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Frequently Asked Questions

What oil does a 79 Series manual gearbox take?

API GL-4 gear oil in 75W-90 viscosity. Approximately 4.5 L capacity. Do not use GL-5 - attacks the synchromesh.

What ATF does the 79 Series 6-speed auto use?

Toyota WS automatic transmission fluid. Approximately 6.5 L total system, 4 L typical refill.

How often should I change the 79 Series gearbox oil?

80,000 km in normal service. 40,000 km in severe service.

Does the new 2.8L use the same gearbox oil as the V8?

Same manual gearbox specification (GL-4 75W-90). Auto fluid is Toyota WS for both.

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