Back

Close Icon

Main Menu

Your order may take longer than normal to arrive. We are experiencing extremely high demand and freight carriers are experiencing delays nationwide. LTL shipments are most severely affected.

Engine and Transmission Flush

Product code : FLSHCN-EA

Prepares Engines and Transmissions For New Oil

Engineered for both gasoline and diesel engines and automatic transmissions. Helps improve operating efficiency, increase fuel economy and reduce emissions.
Engineered for both gasoline and diesel engines and automatic transmissions. Helps improve operating efficiency, increase fuel economy and reduce emissions.

Engine and Transmission Flush



AMSOIL Engine and Transmission Flush (FLSH) helps restore fuel economy, increase operating efficiency and reduce emissions in gasoline and diesel engines, and automatic transmissions. Its potent, detergent-based formula cleans sludge and deposit build-up, promoting reduced oil consumption. AMSOIL Engine and Transmission Flush is safe on parts and can be easily disposed of with waste oil.

Restores Vehicles to Like-New
New engines and transmissions run more efficiently, but over time they gather harmful deposits that cause power and performance loss. Stop-and-go driving, prolonged idling, short trips that do not allow the engine to reach full operating temperature, towing, the ingestion of air-borne dirt, fuel dilution, water condensation and oxidized oil all can promote sludge build-up in motor oil and transmission fluid. As it settles, sludge clogs narrow oil passages, restricting oil flow to vital parts, especially the upper valve train area.

In transmissions, deposits can form on clutch plates, causing hesitation and erratic shifting. Ultimately clutch glazing can set in, reducing the life of the transmission. Deposits in engines and transmissions can accelerate wear, causing power loss and increased fuel consumption.

  • Prepares engines and transmissions for new oil
  • Removes deposits and sludge for improved efficiency, fuel economy and lower emissions
  • Prolongs equipment life
  • Detergent-based formula is environmentally friendly
  • Compatible with seals and gaskets
  • One-treatment results
  • Easily disposed of with waste oil

AMSOIL Engine and Transmission Flush Benefits
Unlike many flush products, AMSOIL Engine and Transmission Flush features a multi-use formulation that dissolves and disperses sludge, varnish and deposits in both engines and automatic transmissions. Due to its detergent-based formulation, it can be easily disposed of with waste oil, making it more user-friendly. Its advanced formula of light base oil technology, powerful detergents and dispersants provides safe cleaning action. AMSOIL Engine and Transmission Flush is compatible with both petroleum and synthetic oils, preparing poorly maintained equipment for installation of new oil. It represents the first step toward restoring neglected equipment to top-notch performance. AMSOIL Engine and Transmission Flush provides the following benefits in only one treatment:

Gasoline and Diesel Engines

  • Helps loosen sticky valves and rings, minimizing blow-by and reducing emissions
  • Helps quiet lifter noise
  • Promotes lower operating temperatures through sludge removal
  • Easy disposal

Automatic Transmissions

  • Cleans deposits in oil cooler and ports
  • Helps unclog fluid passages
  • Cleans deposits and varnish from clutch plates, helping improve efficiency
  • Promotes smoother operation and transmission life through reduced shift delay

Applications
AMSOIL Engine and Transmission Flush is recommended for diesel and gasoline engines, and automatic transmissions. Do not use it in differentials.

Directions for Use
Though it works in one treatment, AMSOIL Engine and Transmission Flush is safe enough to be used at every oil change. If using a flushing machine, follow the manufacturer's recommendation. Otherwise, use the following guidelines:

Engine: Add entire bottle of AMSOIL Engine and Transmission Flush to engine oil fill port. Idle the engine for 10-15 minutes, then immediately drain the oil. Ensure enough time for the system to completely
drain. Remove and replace the engine oil filter. Refill engine with new engine oil in the viscosity grade recommended by the manufacturer.

Transmission: Engage emergency brake. Add entire bottle of AMSOIL Engine and Transmission Flush to transmission oil fill port. Idle for 10-15 minutes; shift through drive and reverse. Do NOT place vehicle under heavy load. Drain entire transmission and torque converter of fluid. FILTER MUST BE CHANGED prior to refilling with new transmission fluid.

NOTE: It is not recommended to flush transmissions that do not have a removable pan or access to the transmission filter.

Automatic transmission clutch plates pre-cleanup.
(above) Automatic transmission clutch plates pre-cleanup. Varnish and glazing is heavy on some of the plates.
Automatic transmission clutch plates after cleanup.
(above) Automatic transmission clutch plates after cleanup with AMSOIL Engine and Transmission Flush reveal lighter glazing and varnish.
Cylinder head pre-cleanup.
(above) Cylinder head pre-cleanup. Note the sludge deposits on and around the valve springs and push rod openings.
Cylinder head after cleanup with AMSOIL Engine and Transmission Flush.
(above) Cylinder head after cleanup with AMSOIL Engine and Transmission Flush. The valve springs and push rod openings are noticeably cleaner, with fewer sludge deposits. The manufacturer's stamping is more easily seen.

Engine and Transmission Flush



Engine and Transmission Flush

  • 5
    Does what it’s supposed to do!!
    By  PHILIP,  a  Verified Buyer  from  Kansas   on  December 02, 2021

    Describe the issue

    Great stuff!! Definitely gets the gunk out and ready for the good stuff!!
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5
    Amsoil flush engine and transmission
    By  NASSIM,  a  Verified Buyer  from  Canada  on  November 19, 2021

    Describe the issue

    Good product, tested volkswagen passat execline 2015 and volkswagen jetta 2017 volsburg.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5
    Won't use anything else from now on!!
    By  MICHAEL,  a  Verified Buyer  from  San Diego, California  on  November 08, 2021

    Describe the issue

    I turn wrenches for a living and have been wanting to check out Amsoil for some time now. I got a couple chevy trucks, 1 with a lifter ticking noise on cold start ever since i got it. I've done few engine flushes with liquimoly or autozone's house brand stuff and never rid it. I used Amsoil's Engine and Transmission Flush and Signature's Series oil and for the first time ever the ticking is completely gone!! they saved me the hassle of ripping off the heads and changing the lifters they made a believer out of me and I'll NEVER use anything else!!
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5
    Engine Flush
    By  PAMELA A.,  a  Verified Buyer  from  Ohio  on  October 19, 2021

    Describe the issue

    We have always used this product in the used cars we’ve purchased. Why put clean oil in a dirty engine.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5
    engine fush
    By  JIM,  a  Verified Buyer  from  403e. harrison st. granville ill.  on  October 18, 2021

    Describe the issue

    not the first time i use it will not be the last Great Product Thanks
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5
    Noticable Difference During Oil Change
    By  JOSH,  a  Verified Buyer  from  Ohio  on  October 14, 2021

    Describe the issue

    I bought my 2013 EcoBoost with 70,000 miles on it. Been using the motorcraft full synthetic in it since purchase. In the last year and a half I put almost 35,000 mi on it and it definitely hasn't been running as smooth. I noticed my oil had been coming out dirtier than normal on the last two oil changes. So I decided to start using amsoil signature series. Before I switched over I drained the oil and threw on a new filter and filled it up with motorcraft full synthetic. After a week of driving on it I dumped a bottle of this flush in the oil and let it idle for 15 minutes. The oil I drained out looked as if I had put another 5,000-10k miles on it. Maybe even dirtier than previous oil changes. I decided to flush it again with some clean oil, and even then more debris and carbon came out(without the additive). I am now switched over to signature series amsoil, hoping that'll make a difference. Only Time Will tell. But as far as flushing out carbon and engine deposits. I can visually verify that this stuff does what it says it will do. Great stuff. Next month we do the transmission!
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5
    Use it every oil change
    By  SAMUEL,  a  Verified Buyer  from  Nyc  on  October 09, 2021

    Describe the issue

    Flush my oil every oil change
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5
    Runs like new!
    By  Maynard,  a  Verified Buyer  from  Colorado  on  October 07, 2021

    Describe the issue

    Made my truck sound and feel like it did when it was new. Increased mileage by 2mpg, 6.7 Cummins, 152k miles.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5
    Works Great
    By  MICHAEL,  a  Verified Buyer  on  October 06, 2021

    Describe the issue

    Cleaned out a ton of crap from my Engine that had previously been leaking diesel fuel into the coolant system and coolant into my oil.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5
    It works!!
    By  JIM,  a  Verified Buyer  from  Austin   on  October 04, 2021

    Describe the issue

    Get that sludge out! Helps to clean rings and restore compression.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?