2018-2025 Audi V6 TFSI: Fuel Additives Not Permitted

Audi has released Technical Service Bulletin (TSB) 00 24 94 2075515/1, advising against the use of certain fuel additives in its 2018-2025 vehicles equipped with the EA839 V6 TFSI engine. This TSB highlights potential risks associated with unapproved additives, which can negatively impact engine performance and longevity. Owners of affected models, including the 2023 Audi Q8, should be aware of this guidance to prevent engine problems.

Important Warning: Fuel Additives Not Permitted

Audi explicitly states that the use of fuel additives in vehicles with the EA839 V6 TFSI engine is not approved and therefore not permitted. This is a critical directive for owners to follow. Only Audi-approved petrol additives may be used, and owners should consult their vehicle's Owner's Manual for corresponding information.

Symptoms of Unapproved Fuel Additive Use

Owners who have used unapproved fuel additives may notice several symptoms indicating potential engine issues. These can manifest as various customer statements or be identified during workshop inspections.

Customer-Reported Symptoms:

• "Increased oil consumption"
• "Engine not running smoothly"
• "Engine maintenance requested"

Workshop Findings:

During diagnosis, technicians may observe specific conditions related to the use of unapproved fuel additives:

• Carbon deposits in the combustion chamber or on injector nozzles, which can be visible using a borescope.
• "Misfiring" of the engine.
• In some cases, a general complaint of "engine maintenance" may be noted without a specific fault code.

These symptoms suggest that the engine is not operating efficiently, potentially due to residue or adverse chemical reactions caused by non-compliant additives. Addressing these issues often requires specialized cleaning or component replacement.

Why Fuel Additives Are Not Permitted

While some fuel additives are marketed to help remove carbon deposits from engine components like combustion chambers, piston rings, or injector nozzles, Audi's technical background indicates a significant concern. The manufacturer warns that a negative impact on the engine's life cannot be ruled out when using unapproved additives. The EA839 V6 TFSI engine is designed to operate optimally with specific fuel formulations, and introducing unauthorized chemicals can disrupt this balance, leading to the observed issues like carbon buildup and misfiring.

Owner Action

If you own a 2018-2025 Audi vehicle with an EA839 V6 TFSI engine, such as the 2023 Audi Q8, it is crucial to refrain from using any fuel additives unless they are explicitly approved by Audi. If you are experiencing any of the symptoms mentioned above and suspect they might be related to fuel additive use, it is recommended to contact your authorized Audi service center. They can perform a proper diagnosis and recommend appropriate actions. Remember, this TSB, 00 24 94 2075515/1, serves as a direct warning from the manufacturer regarding this issue.

Warranty Information

Audi Technical Service Bulletin 00 24 94 2075515/1 is informational only and is not applicable to any Audi Warranty. This means that any repairs or issues arising from the use of unapproved fuel additives may not be covered under your vehicle's warranty. It underscores the importance of adhering to manufacturer guidelines regarding fuel and additive use to maintain your vehicle's performance and warranty coverage.

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Source: NHTSA ID: 11009920, TSB ID: 00 24 94 2075515/1