Toyota Sequoia, XK80 (USA / CAN)

Additional Notes

• The Toyota Sequoia XK80 3.4 AWD carries 1.29 liters in the front differential, a relatively modest figure consistent with a compact front differential housing in an AWD drivetrain where torque distribution is shared with the rear axle.
• The rear differential on the 3.4 AWD and 3.4 RWD without a differential lock holds 5.73 liters, a notably larger capacity that reflects the rear axle's role as the primary load-bearing differential in both drivetrain configurations.
• When the rear differential lock option is present, the rear differential capacity drops to 5.51 liters across both AWD and RWD variants, a reduction of 0.22 liters compared to the standard rear differential, likely attributable to the additional mechanical components of the locking mechanism occupying internal housing volume.
• Under normal use conditions, the front differential on the 3.4 AWD is subject to a check interval of 15,000 miles or 18 months, meaning the fluid level and condition are inspected rather than replaced on that schedule.
• Under severe use conditions, the same 15,000-mile or 18-month interval for the front differential becomes a change interval, requiring full fluid replacement rather than inspection alone.
• The rear differential, whether on the AWD or RWD variant and whether equipped with a differential lock or not, follows the same interval structure: a check at 15,000 miles or 18 months under normal conditions and a fluid change at the same interval under severe conditions.
• The alignment of the 15,000-mile or 18-month interval across all differential positions and both use conditions indicates a unified service schedule for the entire differential system on the 3.4 Sequoia, with the distinction between normal and severe use determining whether the service action is an inspection or a replacement.