The Audi SL is a 1,795 cc, inline — four petrol engine produced between 1970 and 1975. It was developed as a mid — sized, carburetted powerplant for Audi’s compact sedans during the early 1970s. Featuring a cast — iron block, overhead valve (OHV) configuration, and a Solex 32 PDSIT carburettor, it delivered reliable performance with a peak output of 59 kW (80 PS) and 128 Nm of torque.
Fitted primarily to the Audi 60 and Audi 72 models, the SL engine was engineered for economical ur…
Production years 1970–1975 meet German TA-Luft emissions guidelines; no Euro standard applies .
The Audi SL is a 1,795 cc inline-four petrol engine engineered for compact sedans (1970–1975). It combines a durable cast-iron block with single-carburettor aspiration to deliver smooth, predictable performance. Designed prior to formal emissions regulations, it balances mechanical robustness with everyday drivability for its era.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,795 cc | |
Fuel type | Petrol | |
Configuration | Inline-4, OHV, 8-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 83.0 mm × 83.0 mm | |
Power output | 59 kW (80 PS) @ 5,300 rpm | |
Torque | 128 Nm @ 3,000 rpm | |
Fuel system | Solex 32 PDSIT carburettor | |
Emissions standard | TA-Luft (German pre-standard) | |
Compression ratio | 8.8:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Chain-driven camshaft | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 132 kg |
The Audi SL was used across Audi's F104 platform with longitudinal mounting and no licensing partnerships. This engine received platform-specific adaptations—shorter intake manifolds in the coupé variants and emissions-tuned carburettors in Swiss and German markets—and from 1973 the updated cylinder head design, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Engine Finders UK Ltd, which operates EngineCode.uk, can pass your enquiry to engine suppliers in the UK. The service is for vehicles in the United Kingdom, with UK delivery or fitting. This is a commercially connected service, and sending an enquiry does not confirm diagnosis or compatibility.
Diagnostic reminder: If a technician has recommended replacing the engine, you can send an enquiry to engine suppliers in the UK. Confirm the diagnosis first: an engine-code record does not diagnose a fault.
Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from manufacturer technical service bulletins and industry workshop records. Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The Audi SL is fundamentally robust, but pre-1973 models are prone to cylinder head warping if subjected to frequent cold starts or improper maintenance. Post-1973 revisions with improved water jackets and torque procedures significantly improve durability. When serviced regularly with correct oil (SAE 10W-30 API SB), these engines can exceed 150,000 km. Avoid short-trip driving without proper warm-up to minimize thermal stress.
The main issues are cylinder head warping (especially pre-1973), carburettor icing in cold weather, coolant leaks from the water pump, and distributor cap carbon tracking. These are documented in Audi service literature. Overheating due to thermostat failure is also common. Use of incorrect head bolt torque can accelerate head distortion.
The SL engine was used in the Audi 60 (1970–1973) and Audi 72 (1972–1975). It powered L and LS variants in both sedan and estate body styles. It was not used outside Audi or Volkswagen Group models. No MINI or Toyota applications exist for this engine.
Aftermarket ECU tuning is common on the SL platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
Moderate by modern standards. In an Audi 72, consumption averages ~9.8 L/100km (city) and ~6.9 L/100km (highway), or about 29 mpg UK combined. Real-world economy depends heavily on driving style, but 27–31 mpg (UK) is typical for a well-maintained SL engine. Carburettor tuning and driving habits significantly affect efficiency.
No. The SL uses a non-interference OHV valvetrain design. If the timing chain fails, the pistons will not contact the valves, preventing catastrophic engine damage. However, the engine will stop running and require chain replacement. This design enhances reliability but does not eliminate the need for timely maintenance.
Audi specifies SAE 10W-30 oil meeting API SB standards. Modern equivalents with adequate zinc (ZDDP) content are recommended to protect the flat-tappet camshaft. Change oil every 10,000 km or annually to prevent sludge and wear. Use of non-detergent or low-zinc oils can accelerate cam lobe degradation.
Comprehensive technical documentation and regulatory references
EngineCode.uk is operated by Engine Finders UK Ltd. It provides engine-reference information and an optional commercial enquiry service. It is not an official manufacturer website. Check the record's sources and confirm vehicle-specific details before relying on it for parts, repairs or replacement.
Our editorial standard prioritises relevant manufacturer documentation and official regulatory sources. The sources and verification status for a record should be checked alongside the data.
A statement is not verified merely because a source is listed. Where supporting evidence is missing or conflicting, the record should identify that limitation. Please report unsupported or inconsistent information.
Transparency in gaps
A missing or unverified value does not mean the manufacturer has withheld it. We distinguish information not yet verified, information not available to us, and information explicitly not disclosed by the source.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
Records are subject to review and correction. Source links, dates and verification notes should be read with the technical information. Our Editorial and Sourcing Policy explains our standards and review process.
Found an error or missing source? Report a problem with this page. Include the field or statement concerned and a supporting source if available. You can also email corrections@enginecode.uk.
Copyright and permissions
Images and other material may be protected by copyright. Attribution does not by itself grant permission to reuse material. If you believe material on this site infringes your rights, contact copyrights@enginecode.uk with the page URL and details of your claim. We will review the material and take appropriate action.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
Our Privacy Policy explains how Engine Finders UK Ltd uses information from visits, vehicle lookups, enquiries and messages. Our Cookie Policy explains cookies and similar technologies and how to change your choices.
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
Ownership and commercial services
EngineCode.uk is owned and operated by Engine Finders UK Ltd. Alongside our reference content, we offer an optional replacement-engine enquiry service through Engine Finders and may identify relevant services provided by businesses connected with us. These commercial connections are disclosed. Using an enquiry service is not required to read our reference content.
Engine Finders UK Ltd operates this website. Our optional enquiry service has a commercial purpose. Our Ownership and Commercial Disclosure explains the relationship between the reference website and that service. Participating suppliers pay a fee or subscription to participate on the network and receive quote requests.
Use this record as a starting point for identification. Specifications and vehicle applications may contain errors or omissions. Confirm the exact engine variant and compatibility using vehicle-specific documentation and a qualified supplier or technician.
All external links open in new tabs. Please verify current availability of resources.