Talking with my nieces husband which he's very into this racing with his two boys never did i realised how involved it is. .5 dram of wheel oil $30+ and theres more. This is no difference than any other type of racing.
https://derbydad4hire.com/HOLY-WATER-The-Ultimate-Pinewood-Derby-Oil-L-HW.htm
https://derbydad4hire.com/HOLY-WATER-The-Ultimate-Pinewood-Derby-Oil-L-HW.htm