Prestone Command® Heavy Duty 2 in 1 Flush & Degreaser

Introducing Prestone’s NEW Command 2 in 1 Flush & Degreaser, an innovative and easy-to-use cooling system cleaner for heavy-duty diesel cooling systems.

Part 1 is an acid cleaner that dissolves corrosion and scale without damaging metals.

Part 2 is an oil encapsulation system that strips grease and oil from all surfaces and flushes it away. Just one use helps prevent overheating, a major cause of engine failure.

Safe for all:

  • Antifreeze/Coolants.
  • Metals.
  • Gaskets.
  • Hoses.
  • Plastics.


  1. Drain cooling system, add 2 in 1 Flush & Degreaser and refill with water. (Systems larger than 15 qts may require 2nd bottle.)
  2. Bring the engine up to operating temperature and ensure circulation through the entire cooling system for 45-60 minutes. Systems that are especially contaminated can run up to 3 hours.
  3. Thoroughly flush the cooling system with water.
  4. Drain the cooling system and install half the cooling system capacity with Prestone Antifreeze/Coolant, top off with water and thoroughly mix by driving.
  5. Verify the coolant concentration and level and top off as necessary.

Do not reuse container. Keep container closed. Dispose of according to federal, state, or local regulations.

Product Safety Data Sheet

Features & Benefits
  • Eliminate oil & fuel contamination.
  • Strip away corrosion by-product from metal surfaces.
  • Remove aluminum corrosion, silicate gel, and rust.
  • Restores cabin heat.
  • Fast and easy to use.
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