Customer Ratings & Reviews

I only use it twice a year after the summer and after winter to clean inside the motor reviews on it was good so I just used it

Work great on 3.0 duramax

Is easy to use and I feel like it cleaned up the inside of my engine.

So far working as claimed

Broke down gunk prettttty well! Gotta love AMS!

Works great and safe for your engine

I used it as a preventive and believe it did what it is suppose to do. My crankcase on my classic car was not gummed up but the flush helped keep the internals clean.

Good Product

AMSOIL synthetic oils and products are second to none. The are the highest quality, last a long time, and perform extraordinarily well. Nothing better and well worth the cost. No risk with this product. I use the flush often. Follow directions on the label and it does GREAT!

Can feel the difference after use

Put this in my 2019 Acura RDX with 132,000 miles before its oil change. The engine seems to be running much smoother and quieter.

Bought to put in used car purchased With 138000 mi don’t know past care Not on carfax ran car 15 min and drained will drive 3000 mi and install again then change again with new amsoil oil and filter the car is a Honda crv 2015

Outstanding product part of a 18 item purchase including (2) gallon jugs. Shipping box used was horrible. Large box split along (2) of the long seams. Amsoil use a heavier than 32 lb crush box next time.

This product cleans out the buildup everywhere oil circulates. Use as prescribed and it works GREAT.

Wow this stuff works like magic! I’ve always taken great care of my car and changed my oil and filter regularly at 5,000 miles even though the signature series oil is the best PA0 based synthetic oil. I honestly never thought about a flush? Well I had my car since it was new and done every oil change on it never had flushed it before so I did 70,000 miles later and it cleared out the whole oil system! I could tell because I ran my inspection camera through the engine everywhere I was able to and wow after only one time? Never seen anything work so well. Thanks Amsoil for making such great products that actually work.

Use this product often during oil changes. Great product.

If you waited too long between changes or flushes you could see some boogers of varnish flush out but no impact on wear and seems to clean varnish and durable deposits with regular use.

Let's go, try it. :)

Used at every change on my 2017 Mazda 3 2.5 at every 5K oil & filter change with Amsoil Sig Ser. The engine was already very clean when I got it with 67,000 on it. I probably wouldn't if it had sludge -- for fear of filling the pan with goo. Now at 99,600, and 400 away from an oil change -- it still has zero varnish.

This product is excelente. Cleaner is great.