STP® Diesel 3-IN-1 All Season Fuel System Cleaner (946mL)


Just one treatment helps clean, improve performance, and protect your entire diesel fuel system from cold weather. 

Formulated To Help

  • Save Fuel*

  • Boosts Cetane

  • Prevents Fuel Gelling

  • *Helps save gas by deep cleaning entire fuel system

Regular Use Helps:

  • Clean the fuel system to restore lost power, smooth rough-running and improve fuel economy
  • Helps keep fuel-filters from plugging with wax and prevents fuel gelling
  • Boosts Cetane to help improve combustion

Usage Frequency: 

  • Use every oil change or 6,000 kilometers
  • To help save fuel, use every oil change.
  • To help prevent fuel gelling and boost cetane, use every tank.

Treat Rate:

946 mL bottle treats up to 403 litres

Take Note: 

STP® Diesel 3IN1 is suitable for Turbo Engines and Biodiesel Safe, for diesel cars, SUVs, and trucks

Directions for Cold Weather:

For temperatures below -18°C, each 100 mL treats 21 L. 1 bottle treats 201 L. Use each fill up.

What makes diesels different?​

A diesel engine produces more particulate in the system as a result of combustion that can create deposits in the fuel system and can lead to reduced fuel economy and power. Short stop and go trips are more susceptible to this build-up of deposits, typically due to the diesel particulate filter not getting hot enough to regenerate.

Injectors are designed to deliver a precisely measured mist of fuel into the combustion chamber, but a dirty injector will disrupt this fine pattern into a coarse, intermittent stream, and can lead to decreased fuel efficiency. 

Diesel fuels may form waxes or be contaminated with water that can plug the fuel filter. These conditions may result in poor starting, rough idling, poor combustion, hesitation or power loss under acceleration, stalling, loss of fuel economy and increased emissions.

In colder temperatures, the paraffins in diesel may form into gel that can, in severe cases, block the fuel filter and fuel line leading to poor starting or no starts.

Find more STP® Fuel Treatments