2026-07-21 · 5 min read
Toyota Fortuner 4WD System Service Guide
Fortuner 2H/4H/4L 4WD system needs differential oil and transfer case oil every 40,000 km. 4WD engagement problems often stem from neglected fluids.
Fortuner 4WD System Service — Transfer Case & Differentials
Fortuner 4WD (4×4 variants) has a part-time 4WD system with 2H, 4H, 4L modes. The system includes: transfer case, front differential, rear differential. All three have separate oil that must be changed every 40,000 km. Most owners never do this — it's a missed service because it's not in the standard service reminder. Use Toyota Gear Oil LF or equivalent GL-4/GL-5 synthetic for all three.
- Transfer case oil: Toyota Gear Oil LF, capacity ~1.0L, change every 40,000 km
- Front differential oil: GL-5 75W-90 synthetic, ~1.0L, change every 40,000 km
- Rear differential oil: GL-5 75W-90 synthetic, ~1.5L, change every 40,000 km
- 4WD engagement test: with engine warm, engage 4H — should be smooth with no noise or vibration
- Total cost for all three oil services at our workshop: RM 200–350