Cylinder Head Gasket 07C103149Q Fits Audi A8 Audi S8 Volkswagen Phaeton Bentley Continental GT 6.0 W12 Engine Left Side

07C103149Q Left Cylinder Head Gasket – Premium Seal for 6.0L W12 Engines

 Why This Gasket?​
This gasket is a direct replacement for the OEM part 07C103149Q, and it’s also compatible with alternative part numbers 07C129717D and 07C133238H. It’s specially engineered to seal and protect high-performance 6.0L W12 engines, effectively preventing oil and coolant leaks while ensuring the engine maintains consistent power output.​
 Exact Fit Models & Years​
This gasket is precisely compatible with the following models and production years: For the Audi brand, it fits the Audi A8 D3 (produced from 2003 to 2010, exclusive to high-end trim versions) and the Audi A8 D4 (produced from 2011 to 2017, with production discontinued in 2017 for the North American market), both equipped with the 6.0L W12 engine. For Volkswagen, it’s suitable for the Volkswagen Phaeton (launched in September 2002, produced until 2010) and the Volkswagen Touareg (produced from August 2004 to May 2010), both matching the 6.0L W12 engine. For Bentley, it fits the first-generation Bentley Continental GT (a luxury sports coupe produced from 2003 to 2010) and the Bentley Continental Flying Spur (a full-size luxury sedan produced from 2005 to 2013), both powered by the 6.0L W12 engine.​
Note: This gasket is not compatible with the Audi S8, as the Audi S8 uses V8 or V10 engines instead of the 6.0L W12 engine.​
 Engine & Gasket Specs​
The engine displacement matched by this gasket is 5,998 cc, which is equivalent to 6.0L, fully conforming to the specifications of the factory 6.0L W12 engine. In terms of gasket position, it is a left-side gasket, covering the 7–12 cylinder positions of the engine. The gasket is made of a heat-resistant composite material that can withstand temperatures up to 400°C (or 752°F) and high combustion pressure. In terms of sealing scope, it isolates the combustion chambers, coolant channels, and oil passages of the engine, effectively preventing cross-leakage between different fluids.​
 Core Functions & Vehicle Application​
1.Seal Combustion Chambers: It can lock in high-pressure gas (with a pressure resistance of up to 100+ bar) inside the combustion chambers, avoiding power loss caused by gas leakage and preventing engine misfires.​
2.Isolate Fluids: It separates the engine coolant and engine oil. This separation prevents the coolant from entering the oil circuit (which would cause oil emulsification) and also prevents the oil from mixing into the coolant (which would contaminate the coolant), while also helping to prevent engine overheating by ensuring the normal circulation of coolant.​
3.Heat Transfer: It assists in transferring the heat generated by the cylinder head to the engine block, which is crucial for protecting the complex cylinder layout of the W12 engine and maintaining the engine’s normal operating temperature.​
4.Gap Compensation: It can fill in the tiny irregular gaps between the cylinder head and the engine block, ensuring a tight and reliable seal even after the engine has been in long-term use.​
 Installation & Maintenance Tips​
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Mounting Requirements: When installing, the printed side of the gasket must face upward. At the same time, align all bolt holes of the gasket with the corresponding holes on the cylinder head and engine block, and ensure that the coolant and oil passages of the gasket are accurately matched to the 7–12 cylinder positions of the engine.​
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Torque Requirement: When tightening the cylinder head bolts, it is necessary to carry out the operation in 2–3 stages and strictly follow the OEM torque specifications (specifically 25 N·m, followed by two additional 90° turns).​
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Replacement Rule: Old gaskets must not be reused. For comprehensive engine protection, it is recommended to replace this left-side gasket together with the right-side gasket (part number 07C103148Q) during maintenance.​
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Warning Signs for Replacement: If the engine emits white smoke from the exhaust, there is abnormal loss of coolant, or the engine oil appears milky (a sign of coolant mixing into the oil), these are indicators of possible gasket failure, and the gasket should be replaced in a timely manner.​
 Quality Assurance​
This gasket is manufactured in accordance with OEM-grade standards, fully meeting the strict quality requirements of the VW Group for 6.0L W12 engines. It comes with a 12-month warranty, covering any material defects or leakage issues that may occur within the warranty period. Additionally, its fitment has been verified against the latest 2025 auto parts databases, ensuring there are no fitment problems when used with the aforementioned compatible models.