| The layout of the dual clutch gearbox 0BH „S tronic“ is basically similar to that of a 7-speed manual gearbox. The engine torque is transferred to the gearbox via the dual-mass flywheel. The two multi-plate clutches are controlled hydraulically and actuated alternately so that the gearbox is operated like an automatic gearbox, in other words the gears are engaged automatically (but can also be selected manually via the tiptronic function). There is no clutch pedal. For further information please refer to → No.454. |
| In selector lever position „P“ the selector lever cable is used to engage the parking lock mechanically. All other gearshift commands and selector lever positions are transmitted via the CAN data bus from the selector lever -J743- (selector mechanism) to the mechatronic unit for dual clutch gearbox -E313-. |
| Gear oil (gearbox and bevel box) |
| The dual clutch gearbox „0BH“ has a common oil system. |
| This oil system lubricates the gears and shafts, the final drive, the clutches and the mechatronic unit for dual clutch gearbox -J743-. |
Caution | Risk of damage to gearbox |
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| Other types of oil cause malfunctions and/or failure of the gearbox. |
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| The bevel box has a separate oil filling → Chapter. |
Caution | Risk of damage to the bevel box. |
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| Other oils cause faults and/or failure of the bevel box. |
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| When does the gear oil filter have to be changed? |
Note | The gear oil filter does not always require replacement. |
| Do not change the filter if: |
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| The gear oil cooler or its O-rings have been renewed and no coolant has entered the oil system. |
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| Oil seals or O-rings have been renewed in the gearbox. |
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| The oil pan or mechatronic unit have been renewed. |
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| The maintenance interval has been reached. |
| The filter must be changed if: |
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| Metal particles are found in the oil. |
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| The clutch is burnt out or mechanically defective. |
| Variation of gear-change points for gradients |
| An additional gear change map automatically selects gear changes for gradients depending on accelerator pedal position and driving speed. |
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| Gear change map for extreme uphill gradients is matched to engine output |
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| Gear change map for extreme downhill gradients is matched to the braking effect of the engine |
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| Increased engine braking effect can also be obtained by directly selecting a specific gear via the tiptronic function, e.g. when towing a trailer on downhill gradients |
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