T25,T4,G1,G2,G3,G4 8mm Valve Stem Seal - See More Info For Fitment

This 8mm valve stem oil seal is a direct-replacement component used across a huge range of Volkswagen diesel and petrol engines. Its job is simple but critical: it controls the amount of engine oil that lubricates the valve stem as it moves up and down inside the cylinder head. By metering oil correctly, the seal prevents excess oil from being drawn into the combustion chamber while still allowing enough lubrication for smooth valve operation.

Worn or hardened valve stem seals are a common cause of blue exhaust smoke, increased oil consumption, fouled spark plugs, and poor idle quality. Replacing tired seals during a cylinder head rebuild or valve service helps restore proper engine efficiency and prolongs valve guide life.

How it works

The seal presses over the valve guide and grips the valve stem with a precision-formed lip. As the valve opens and closes, the seal wipes away excess oil while allowing a controlled film to pass through. This balance is especially important on diesel engines, where high vacuum conditions during overrun can pull oil past worn seals.

Fitment notes

• Inner diameter: 8mm

• Quality: Good quality replacement

• Quantity: Sold individually (check engine type for total required)

• Position: Fits inlet and exhaust valves where specified by the engine design

Compatible vehicles & engines (summary)

This valve stem seal is used on a wide range of VW platforms, including:

• VW Type 25 (T3) Buses – all diesel engines including Turbo Diesel models (CS, JX)

• VW T4 Transporter – all petrol and diesel engines except VR6 (PD, AAC, AAB, AAF, ACU, 1X, ABL)

• VW Golf Mk1 & Mk2 – all petrol and diesel engines excluding 16-valve variants

• VW Caddy Mk1, Jetta Mk1 & Mk2, Scirocco, Polo Mk1/Mk2/Mk3 (diesel & petrol variants)

• VW Corrado – G60 PG and selected 2.0 models

Also commonly used across many classic VW engine codes including CS, JX, PD, 1X, ABL, AAC, AAB, AAF, ACU, EG, DX, JH, CR, and many more.

Installation advice

When replacing valve stem seals, it’s strongly recommended to:

• Replace all seals as a full set to ensure even oil control

• Inspect valve guides for wear

• Renew valve stem seals whenever the cylinder head is removed

This part is ideal for engine rebuilds, head overhauls, or curing oil-burning issues on classic and early water-cooled Volkswagens.