Subaru BRZ 2018 Owner's Manual page 351

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Allow inspection and repairs to be performed by a SUBARU dealer
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SUBARU technicians are well-trained specialists and are kept up to date
with the latest service information. They are well informed about the
operations of all systems on your vehicle.
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Keep a copy of the repair order. It proves that the maintenance that has
been performed is under warranty coverage. If any problem should arise
while your vehicle is under warranty, your SUBARU dealer will promptly
take care of it.
4-2. Maintenance
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