Customer Ratings & Reviews

Great product to use...really clean up deposits.

Now even though my car is new, (2020 Honda Civic Type R) at 3000 miles I went ahead and changed out the oil with Amsoil's 0W-20. Before doing this I did something that I'm not sure I was suppose to do and that was to flush out the engine before adding in the new oil. So far things have been great. Time will tell if I made a mistake in doing this, but I just wanted to keep the engine as clean and maintained as possible.

Ran this stuff through a 05 Civic with 225k miles on it. Drained oil pan and oil came out with small sludge clumps and very dark. Not used oil dark. You could tell it had cleaned the internal engine components. Quieted the valve lifters also. Worked as advertised!

When I flushed my oil with this product, there were black sludge deposits that looked like a giants snot wads. Great cleaning power!

I use this with every oil change.Years ago I did not, and notice new oil appeared dirtier sooner without the flush.

Great product, works well especially with the extended drain intervals.

Before I put it in . I Took off the oil cap filler you could really see How brown it was from the oil stains after flush it was very shiny!

Amsoil Engine and Transmission Flush is a great way to start you oil change process! Used it in my 2018 5.7 RAM last oil change and got noticeably higher oil pressure. My engine also seemed much quieter!

For engine flush is the best over all

I've never used this in my transmission but I've used this to prep two engines for Amsoil Signature Series. It is great for cleaning out pockets of sludge in the engine! The oil that came from my oil change in the 1987 Ford 300 was very thick and dark. I have maintained that truck engine since it was my daily driver for six to seven years.

I feel great knowing that the oil im putting in is not gonna be contaminated by gunk in the engine.

BMW S1000XR. 52k on the bike, runs better than new. I expect to post someday with an extreme mileage score on original motor.

When you see the black color of the old oil you say to yourself : a regular flush is not enough. Why contaminate your new oil.

This gets out all the old and makes more room for the new. The only oil products I use!

Use this Before oil changed. You can definitely see the loose sludge particles come out after using it

Are you still in my voice Chevy Cruze for the oil change. And can actually see sludge particles come out when draining the engine oil after use.

Great Product

If you want to have the full protection amsoil can provide you need to run this through your vehicle first. It makes a huge difference, and will allow your vehicle to get the best out of having amsoil in it. Don't do this first ypu are robbing your vehicle of the protection amsoil can give it.

I used this product in a used municipal vehicle that I purchased at auction. Amsoil flush removed the varnish and build up in the top end of the engine and also solved the lifter ticking noise at start up. Definitely a must when changing oil in a used vehicle with no service records.

Used the flush in two of my vehicles and observed the dirty sludge that came out. I followed it up with Amsoil oil and the Performance Improver. Both are running great and seem to be running better than ever. Still in the trial stage, but so far I definitely recommend Amsoil!