Volkswagen Golf GTI 2016, Owner'S Manual

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Break-in period
Please first read and note the introductory information and
heed the WARNINGS →
Introduction
Note applicable requirements for breaking in new parts.
Breaking in a new engine
A new engine must be carefully broken in during the first 1000 miles
(1600 kilometers). During the first few hours of driving, the engine's
internal friction is higher than later when all moving parts have been
broken in.
Engine life is influenced by how you drive the vehicle for the first
1000 miles (1600 km). Even afterwards, driving at moderate engine
speeds, especially when the engine is cold, will tend to reduce
engine wear and help the engine to last longer and go farther. But
do not drive at an excessively low engine speed, either. Always
downshift if the engine is not running smoothly. For the first
600 miles (1000 km):
Do not use full throttle.