This announcement follows others series officials have made over the last month, including a deal with NTT to become IndyCar's new title sponsor.
Danica Patrick got her No. 13 car up to speed quickly Wednesday at the Indianapolis Motor Speedway.
Sebastien Bourdais took the IndyCar pole Friday night at ISM Raceway to join Simon Pagenaud in an all-French front row.
Portland International Raceway is back on the IndyCar Series schedule in 2018.
The race for the IndyCar title tightened significantly with one race left in the season.
Cars were back on the track Tuesday at Indianapolis Motor Speedway.
The 42-year-old Castroneves led 217 of 300 laps.
Dixon's 41st career victory moved him within one of tying Michael Andretti for third on the all-time list.
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