Where is the engine number located on the old Audi A6 V6?
2 Answers
Old A6 engine numbers are generally located on the lower left side of the engine, and sometimes on the side of the cylinder block near the flywheel. It usually consists of a combination of 7 to 8 digits and letters. In addition to the above method, the engine number can also be checked through the following 4 ways: The vehicle license shows the engine number, usually located on the second last line; The motor vehicle registration certificate will indicate the engine number; The car purchase invoice will indicate the engine number; The vehicle purchase tax payment certificate will indicate the engine number. Note that the engine number is not the same as the engine model. The engine model refers to the specification and size of the engine within the manufacturer, and engine models can be the same. The engine number refers to the production number of the engine, each engine can only use one engine number and each engine's number is different.
As an owner of an old Audi A6 V6, I’ll share some practical experience. The engine number is usually located on the engine block, either on the left or right side, near the cylinder head or crankcase area. Specifically, after opening the hood, look directly down at the main engine area—there’s often a stamped number there. You’ll need to clean off dust and use a strong flashlight to spot it, as aging may obscure details. If there’s rust, lightly spray some oil and wipe it off. Never attempt this when the engine is hot to avoid burns. The exact position may vary slightly depending on the model year—for example, pre-2000 models often have it on the lower left side, while post-2005 models may have it on the mid-right. If you can’t find it, check the owner’s manual or take a photo and seek help online to avoid scratching and damaging the area. The engine number is the vehicle’s ID—essential for transfers and repairs—so checking its legibility during regular maintenance is crucial. Don’t overlook this small detail; it can have a big impact.
