Fuel Deliveries On-Site FuelingInterState Oil Company is the leading On-Site Fueling provider in California and Nevada. Fuel Portal LoginWe offer a secure and convenient online access for your fleet card management anytime of the day. Alternative FuelsA leader in promoting the use of alternative fuels in the California and Nevada markets. Bulk Fuel DeliveriesInterState Oil Company provides bulk fuel deliveries of all grades of gasoline, diesel fuel, kerosene, and Jet A in both transport and tankwagon quantities. Diesel Exhaust FluidDiesel Exhaust Fluid (DEF) is one of the key elements of the Selective Catalytic Reduction (SCR) process used by most medium and heavy-duty engine builders. Fuel PurchasingInterState Oil Company provides a variety of customized fuel risk management purchasing programs for all types of customers.