Audi Audi S8 2012-2018

Audi Audi S8 2012-2018 AL551 Transmission Specifications

Detailed technical specifications for the AL551 8-speed automatic transmission used in the 2012-2018 Audi S8. This document covers gear ratios, torque capacity, fluid specifications, shift patterns, and diagnostic codes specific to the AL551 transmission system.

Updated Oct 14, 2023

Overview Specifications

Comprehensive description of the al551-transmission specifications for the 2012-2018 Audi S8, including key features, measurements, and technical details

How to Use

Use the search function to locate specific al551-transmission specifications by entering keywords such as 'torque converter', 'gear ratios', or 'fluid capacity'.

Navigate through the documentation sections using the table of contents or by scrolling through the major sections: General Specifications, Gear Ratios, Torque Converter, and Maintenance.

Key Specifications

Transmission Type

8-speed automatic (Tiptronic)

Maximum Torque Capacity

800 Nm (590 lb-ft)

Transmission Fluid Capacity

9.5 liters (10.0 quarts)

Weight

98 kg (216 lbs)

Final Drive Ratio

3.090:1

Available Specifications

General Specifications

Detailed technical specifications and measurements for the al551-transmission

Transmission Type and Configuration

8-speed automatic transmission (Tiptronic)
Longitudinal mounting configuration
All-wheel drive (quattro) compatibility
Maximum torque capacity: 800 Nm (590 lb-ft)
Weight: 98 kg (216 lbs)

Fluid Capacity and Type

Transmission fluid capacity: 9.5 liters (10.0 quarts)
Recommended fluid: Audi Genuine ATF (G 055 005 A2)
Fluid change interval: 60,000 miles or 6 years
Fluid operating temperature range: -40°C to 150°C (-40°F to 302°F)

Note: Use only Audi-approved transmission fluid to ensure optimal performance and longevity.

Gear Ratios

Detailed gear ratios and performance characteristics of the al551-transmission

Forward Gear Ratios

1st gear: 4.714:1
2nd gear: 3.143:1
3rd gear: 2.106:1
4th gear: 1.667:1
5th gear: 1.285:1

Additional Gear Ratios

6th gear: 1.000:1
7th gear: 0.839:1
8th gear: 0.667:1
Reverse gear: 3.317:1
Final drive ratio: 3.090:1

Torque Converter

Technical details and specifications of the torque converter in the al551-transmission

Torque Converter Specifications

Lock-up clutch type: Electronically controlled
Stall torque ratio: 2.0:1
Maximum engine speed: 7,000 rpm
Diameter: 258 mm (10.16 in)
Weight: 12.5 kg (27.6 lbs)

Performance Characteristics

Smooth engagement for improved drivability
Optimized for high-torque applications
Reduced slippage for better fuel efficiency
Enhanced cooling for prolonged durability

Note: The torque converter is designed to handle the high torque output of the Audi S8's 4.0L V8 engine.

Maintenance

Maintenance procedures and intervals for the al551-transmission

Service Intervals

Transmission fluid change: Every 60,000 miles or 6 years
Filter replacement: Every 60,000 miles or 6 years
Inspection of seals and gaskets: Every 30,000 miles
Diagnostic scan for error codes: Annually

Common Maintenance Tasks

Check and top off transmission fluid levels
Inspect for leaks around the transmission housing
Monitor transmission temperature during operation
Replace worn or damaged components as needed

Note: Regular maintenance is critical to ensure the longevity and performance of the al551-transmission.

Search Specifications

Search by specification name, value, or description

Transmission Specifications

General information

Transmission Type: 8-speed automatic

Manufacturer: ZF Friedrichshafen AG

Part Number: 0BK 300 051

Model Year Range: 2012-2018

Vehicle Model: Audi S8

Drive Type: Quattro all-wheel drive

Dimensions And Weight

Length: 720 mm

Width: 550 mm

Height: 420 mm

Weight: 98 kg

Fluid Capacity: 9.5 liters

Gear Ratios

1st Gear: 4.714:1

2nd Gear: 3.143:1

3rd Gear: 2.106:1

4th Gear: 1.667:1

5th Gear: 1.285:1

6th Gear: 1.000:1

7th Gear: 0.839:1

8th Gear: 0.667:1

Reverse Gear: 3.317:1

Torque Capacity

Maximum input Torque: 1000 Nm

Recommended Torque Limit: 800 Nm

Torque Converter Lockup Speed: 1800 rpm

Operational Parameters

Maximum Engine Speed: 7200 rpm

Shift Response Time: 200 ms

Operating Temperature Range: -40°C to 150°C

Fluid Type: Audi ATF 8HP

Fluid Pressure: 4.5 bar

Electronic Controls

Tcu Part Number: 0BK 927 156

Sensors

Input speed sensor
Output speed sensor
Temperature sensor
Pressure sensor

Communication Protocol: CAN bus

Software Version: 8HP90A

Maintenance Specifications

Fluid Change interval: 60000 miles or 60 months

Filter Change interval: 60000 miles or 60 months

Seal inspection Interval: 120000 miles or 120 months

Torque Converter inspection Interval: 120000 miles or 120 months

Fluid Specification: Audi ATF 8HP (part number: G 055 005 A2)

Diagnostic Specifications

Diagnostic Tool: VAS 5054A or equivalent

Fault Codes

P0700 - Transmission Control System Malfunction
P0715 - Input/Turbine Speed Sensor Circuit Malfunction
P0720 - Output Speed Sensor Circuit Malfunction

Diagnostic Procedure: Use VCDS or ODIS for fault code reading and clearing

Self Diagnostic Capability: Yes

Safety information

Fluid Temperature Warning: Do not exceed 150°C

Pressure Warning: Do not exceed 5.5 bar

Safety Precautions

Use only Audi-approved transmission fluid
Ensure proper lifting and support during service
Follow torque specifications for all bolts

Related Components

Transfer Case: Part Number: 0BL 409 051
Ratio: 40:60 front-to-rear

Driveshaft: Part Number: 4G0 521 101
Material: Aluminum alloy

Differential: Front Part Number: 0BL 409 052
Rear Part Number: 0BL 409 053
Ratio: 3.09:1

Service Information Service

Detailed service requirements and schedules for the AL551 transmission

60000

Transmission fluid change
Transmission filter replacement
Inspect seals and gaskets

Use only Audi-approved ATF 8HP fluid

120000

120

Inspect torque converter
Check transmission mounts
Perform diagnostic scan

Replace any worn or damaged components

Common Questions

Find answers to common questions about torque specifications

What type of transmission is the AL551 used in the 2012-2018 Audi S8?

The AL551 is an 8-speed Tiptronic automatic transmission with quattro all-wheel drive. It features a torque converter and is designed for high-performance applications, supporting up to 800 Nm of torque.

What is the recommended transmission fluid for the AL551?

Audi recommends using genuine Audi ATF (Automatic Transmission Fluid) part number G 055 005 A2. The fluid capacity is approximately 9.5 liters, but always refer to the service manual for exact specifications during fluid changes.

How often should the AL551 transmission fluid be replaced?

Audi does not specify a fixed interval for transmission fluid replacement under normal conditions. However, for severe driving conditions (e.g., frequent towing, high-performance use), it is recommended to inspect the fluid every 40,000 miles and replace it if necessary.

What are the common symptoms of AL551 transmission issues?

Common symptoms include delayed or rough shifting, transmission slipping, unusual noises (e.g., whining or grinding), and warning lights such as the 'Transmission Malfunction' indicator. These issues may require diagnostic scans using Audi-specific tools like VCDS or ODIS.

Can the AL551 transmission be reprogrammed or updated?

Yes, the AL551 transmission control module (TCM) can be reprogrammed using Audi's official software tools (e.g., ODIS). Updates may address shifting behavior, improve performance, or resolve software-related faults.

Factory Service Resources

Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.

Audi AL551 Transmission Service Manual

Coming Soon

Official service manual for the AL551 transmission, including detailed procedures for maintenance, repair, and diagnostics.

Audi ATF Fluid Specifications

Coming Soon

Technical bulletin outlining the approved transmission fluids and their specifications for the AL551 transmission.

AL551 Transmission Diagnostic Guide

Coming Soon

Step-by-step guide for diagnosing common issues with the AL551 transmission using Audi diagnostic tools.

Audi S8 Performance Tuning for AL551

Coming Soon

Technical resource on performance tuning options for the AL551 transmission in the Audi S8, including software updates and hardware modifications.

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