Best Fuel Additives by Use Case and Business Type
Best additive for gasoline fleets and everyday drivability
Red Line SI-1 targets injector and intake deposits to restore idle quality and MPG, which helps passenger and light commercial fleets maintain consistent performance on fixed service intervals.
Best diesel additive for year-round fleet reliability
Red Line 85 Plus Diesel Catalyst improves ignition quality and lubricity for ULSD, which supports quieter running and reduced smoke in delivery, municipal and construction fleets.
Best diesel additive for cold weather operations
Red Line Anti-Gel helps prevent waxing and filter plugging at low temperatures, which simplifies winterization plans for yard tanks and road equipment.
Best cooling-system additive for heavy-duty diesel
Diesel WaterWetter enhances heat transfer in high-load duty cycles and supports temperature stability for long-haul and vocational trucks.
Best additive for alcohol-based fuels and RC or race applications
Alcohol Fuel Lubricant helps prevent gelling and corrosion in methanol and nitromethane systems, which protects pumps and injectors in competition and hobby use.
Best additive for water contamination control
Fuel System Water Remover treats mixed fleets by reducing the freezing point of trapped water and improving lubricity, which is useful for seasonal storage and high-humidity regions.
Best treatment for high-mileage gasoline vehicles
Royal Purple Max-Restore is formulated to address deposit-related power loss and drivability issues that accumulate with age, which makes it a practical choice for service writers and used-car reconditioning.
FAQ
How often should a gasoline fleet use SI-1
Many shops use SI-1 at oil change intervals for maintenance, and increase frequency for vehicles with heavy idling or short trips. Always follow product directions and your service policy.
When do diesel fleets need Anti-Gel versus 85 Plus
Use Anti-Gel during cold seasons to maintain flow and filterability. Use 85 Plus year-round to improve ignition quality and provide detergency and lubricity.
Can Diesel WaterWetter be used with conventional coolants
Yes. Diesel WaterWetter is designed to work with common antifreeze mixes to improve heat transfer in heavy-duty cooling systems.
Will Alcohol Fuel Lubricant help RC and methanol systems
Alcohol Fuel Lubricant provides upper-cylinder and fuel-system lubrication and helps resist corrosion and gelling in methanol or nitromethane blends.
What if there is condensation or water in storage tanks
Fuel System Water Remover reduces the freezing point of trapped water and helps move small amounts through safely. Severe contamination should be drained and filtered per maintenance guidelines.
Do you have a treatment for older gasoline vehicles with rough idle
Royal Purple Max-Restore is designed to address deposit-related drivability in high-mileage platforms and can be used as part of a reconditioning plan.