Hyundai Sonata LF: Dual Clutch Transmission Assembly / Transmission Gear Oil Repair procedures

Hyundai Sonata LF 2014-2019 Service Manual / DCT (Dual Clutch Transmission) System / Dual Clutch Transmission Assembly / Transmission Gear Oil Repair procedures

Inspection
   
•
In principle, the transmission oil is maintenance-free, and no exchange is required.
But it must be inspected and replenished every 4 years or 40,000 miles.
1.
Park the vehicle on flat ground and turn off the engine.
2.
Remove the under cover.
(Refer to Engine Mechanical System - "Engine Room Under Cover")
3.
Remove the oil filler plug (A), and check the oil state and oil level.

   
•
Oil level must be up to fill the hole, if not, add oil until it runs over.

4.
Install the filler plug bolt (A) with new gasket.
Tightening torque :
58.9 ~ 78.5 N.m (6.0 ~ 8.0 kgf.m, 43.4 ~ 57.8 lb-ft)
5.
Install the under cover.
(Refer to Engine Mechanical System - "Engine Room Under Cover")
Replacement
   
In principle, the Dual Clutch Transmission (DCT) oil is not changed under normal driving conditions.
However, under harsh driving conditions, it must be changed every 80,000 miles.
Harsh driving conditions are as follows:
•
High frequency driving on rough roads (bumpy roads, sand and gravel roads, snow-covered roads, and unpaved roads)
•
Frequent driving on mountain trails and inclines
•
In case the vehicle is used as a police vehicle, taxi, or for commercial or towing purposes
•
Frequent high speed driving (over 170 km/h)
•
In case of driving 50% or more of the total mileage in hot temperatures above 32°C and congested traffic
1.
Remove the under cover.
(Refer to Engine Mechanical System - "Engine Room Under Cover")
2.
Remove the drain plug (A) and drain all the oil. Then install the drain plug with a new gasket.
Tightening torque :
58.9 ~ 78.5 N.m (6.0 ~ 8.0 kgf.m, 43.4 ~ 57.8 lb-ft)

3.
Add new oil through the filler plug hole (A) and, fill it just below the plug opening.
Standard oil : API Service GL-4, SAE 70W
Recommnend oil (SHELL: SPIRAX S6 GHME 70W DCTF, SK: HK DCTF 70W, GS CALTEX: GS DCTF HD 70W)
Oil capacity : 1.9 L (0.50 U.S.gal., 2.01 U.S. qt., 1.67 lmp qt.)

4.
Install the filler plug bolt (A) with new gasket.
Tightening torque :
58.9 ~ 78.5 N.m (6.0 ~ 8.0 kgf.m, 43.4 ~ 57.8 lb-ft)
5.
Install the under cover.
(Refer to Engine Mechanical System - "Engine Room Under Cover")

    Transmission Gear Oil General Information

    General Information 1. Check & Change intervals Check & ReplenishmentChangeCapacityOil specificationNormal UseSevere Use60000 km / 4 years(40000 miles / 4 years) No service required120000 km(80000 miles)1...

    Dual Clutch Transmission Control System

    ..

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