Volkswagen Golf GTI 2016, Owner'S Manual

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large, thick rag.
Never spill fluids on the engine or exhaust system when
refilling. Spilling fluids onto hot parts of the engine or exhaust
system can cause a fire. Under some conditions, the ethylene
glycol in engine coolant can catch fire.
Use distilled water only when adding coolant! All other types of
water contain chemical compounds that can cause extensive
corrosion damage to the engine. This can even lead to engine
failure. If you have added non-distilled water, take the vehicle
immediately to an authorized Volkswagen dealer or an
authorized Volkswagen Service Facility to have the coolant
system drained, flushed, and refilled completely with the
proper coolant.
Refill engine coolant only up to the top edge of the marked fill
range → Fig. 193 . Excess engine coolant may be forced out of
the engine cooling system when it gets hot and cause
damage.
In the case of significant engine coolant loss, refill engine
coolant only when the engine is completely cooled down.
Significant engine coolant loss is a sign of leaks in the cooling
system. Have the engine cooling system checked immediately
NOTICE