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Amsoil Engine and Transmission Flush

Last updated: February 22nd, 2026
Amsoil Engine and Transmission Flush (FLSH)

This product is specially formulated to clean out harmful sludge and deposits that build up in both engines and automatic transmissions. Designed with a potent detergent package, Amsoil engine and transmission flush effectively increases fuel economy,reduces oil consumption and lowers engine temperature. Also a must have for those switching to Amsoil synthetics for the first time.

Available Packaging for FLSH

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Technical Info PDF

This product will typically ship within 24 hours from one of Amsoils 14 distribution centers in North America. This means that the product will ship to you from the closest possible location and most orders end up arriving in two to three days or less! Expedited shipping options are available as well.

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Amsoil Engine Flush Frequently Asked Questions
It cleans sludge and deposits from engines and transmissions to improve fuel economy, reduce emissions, and restore efficiency.
Yes. It is safe for both gasoline and diesel engines, as well as automatic transmissions.
Yes. Its detergent-based formula is compatible with seals, gaskets, and common engine materials.
It cleans clutch plates, oil coolers, and fluid passages to reduce shift delay and improve transmission life.
Yes. It is safe enough for use at every oil change and works in one treatment.
Add 16 oz. to engine oil, idle for 10–15 minutes, then drain completely and replace the oil filter before refilling.
Add 16 oz., idle for 10–15 minutes while shifting through gears, then drain and replace the transmission filter before refilling.
Yes. It is detergent-based and can be safely disposed of with waste oil.
Yes. It helps quiet lifter noise and loosen sticky valves and rings, improving overall engine smoothness.
No. It is not recommended for CVT transmissions or differentials.

The Performance Oil Company

An Authorized Amsoil Dealer
Allenton, Wisconsin 53002
(262)-388-3411