I have done a Google search and came across this for anyone else whe has the same concerns as me hoe this helps
Toothed belt for valve train
Due to its design, internal friction in the small three-cylinder engine of the Golf TSI BlueMotion is already rather low. Moreover, this engine also benefits from the overall innovative design layout of the EA211 engine series and related measures implemented to reduce internal friction. This not only relates to the crankshaft group, as mentioned above, but also to the valve control and auxiliary drives. The 1.0 TSI is equipped with inlet and exhaust camshaft adjustment; the adjustment range is 50 degrees of crankshaft angle on the inlet side and 40 degrees on the exhaust side. By taking this approach, the designers of the three-cylinder engine achieve a powerful torque build-up at low engine revs and high power at high revs. The two overhead camshafts are driven by the crankshaft via a toothed timing belt. Compared to a chain drive, it exhibits around 30 per cent less friction. Thanks to its high-end material specification, this toothed timing belt's service life reliably spans the entire life of the vehicle. As a result, it is no longer necessary to perform the previously obligatory replacement of the toothed belt as a maintenance item. Overall, the ingeniously harmonised forces of the toothed belt drive lead to low friction, improved fuel economy and greater durability.
