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Autopapyrus · Kia Soul 1.6 MPI (2016)
https://autopapyrus.com/guides/kia/soul/manual-transmission-fluid-change/
Compiled automatically from service literature and owner experience. Specs are for the typical configuration — check them against your exact car before you start.

Kia Soul 1.6 MPI (2016): Manual Transmission Fluid Change

Changing the fluid in the 6-speed M6CF1 manual transmission on a Soul with the 1.6 MPI engine is done every 100,000-120,000 km under severe driving conditions (manufacturer's schedule). The job is simple, but you need a lift or an inspection pit to reach the underside.

Difficulty: Medium Time: 30-40 minutes Steps: 11 Tools: 24 mm wrench (drain plug), 24 mm wrench (fill plug), 2-3 L (2.1-3.2 qt) drain pan, funnel with flexible hose or fluid pump, torque wrench

Part

  • 🔩 Manual transmission fluid SAE 70W or 75W-85, API GL-4 (OEM Kia/Hyundai or equivalents such as Red Line MT-85, ZIC G-FF 75W-85). Capacity 1.6-2.0 L (1.7-2.1 qt). Manual transmission drain plug gasket
There's a full repair manual for this car Every system, wiring diagrams and torque specs — not just this job. Haynes AutoFix (online) and 1 more. See manuals →

Step by step

11 steps
  1. Warm up the transmission by driving for 5-10 minutes so the fluid flows easily and carries out the deposits.
  2. Raise the front of the car on a lift or drive it over an inspection pit. Secure it with the parking brake.
  3. From underneath, locate the transmission housing (on the driver's side in left-hand-drive markets, i.e., the left side in the direction of travel). The drain plug is closer to the inner CV joint; the fill plug is higher and closer to the front bumper.
  4. Loosen the fill plug (the upper one) with a 24 mm wrench, but do not remove it completely. This is the fluid level check hole.
  5. Place the drain pan under the transmission and remove the drain plug (the lower one). Let the fluid drain for 10-15 minutes.
  6. Inspect the drain plug. If it has a magnet, wipe off any metal particles (a small amount is normal).
  7. Replace the copper or aluminum gasket on the drain plug and install the plug. Tightening torque is 35-45 N·m (26-33 lb-ft) (check the exact value in the manufacturer's specifications for the M6CF1).
  8. Fill with fluid through the fill hole. Use a flexible funnel with a hose or a hand pump, since space is limited. Keep filling until fluid starts to run out of the fill hole. That is the correct level. Total capacity is 1.6-1.8 L (1.7-1.9 qt) for the 1.6 MPI.
  9. Install the fill plug with a new gasket. Tightening torque is 35-45 N·m (26-33 lb-ft).
  10. Lower the car, start the engine, and shift through all the gears (holding each for 2-3 seconds) so the fluid is distributed.
  11. Recheck the level after the engine has idled for 5 minutes. Loosen the fill plug. At the correct level, a small amount of fluid should seep out.

Common mistakes and warnings

  • Use only GL-4 fluids, NOT GL-5. GL-5 fluids contain sulfur-phosphorus additives that damage the synchronizers in a manual transmission with copper (yellow metal) parts. Using the wrong fluid causes hard shifting and premature transmission wear.