While the top GT500 division has been using CNF since the start of the season, problems for some GT300 cars using the new ETS Racing Fuels-supplied product during pre-season testing prompted series organisers GTA to delay its introduction for the lower class.
A two-day test was held at Suzuka following the most recent race at Fuji earlier this month to give the GT300 teams another chance to validate improvements made to the fuel in recent months.
