Customer Ratings & Reviews

I added to all three cars with the idea that on DI, the inlet will be clean. I never w degradation - so no idea if it works. I'll give it as a recommendation for now and 4 stars. If I find evidence for improvement, I'll rank this as 5 stars. Cars are two 992.2 3.0L and an Explorer 3.0L.

Two of four spark plugs had center electrodes worn to double the specified gap, and 1 plug wire was arcing on intake manifold. Check engine light on with OBD2 misfire diagnosis on cyl 4. Looking at the deposits on the plugs I suspected cylinder heads and injectors may have been affected. I am hoping this product removes deposits built up during misfires.

I use this with my all my vehicles. Great product and great price. Wish it was just a bit easier to get the white seal off the top of the bottle. Starting to feel the power return. Whoa.

I'm not a scientist, so I can't provide anyone with specifics. It seems to do a good job of keeping the engine internals clean. I use it at every oil change on my wife's car.

Put this in my 2016 Honda Pilot Touring and it seemed to make my Pilot run smoother. It could be a Plasibo effect but I never got the same feeling when using another brand Seafoam.

Yes it works!!! I've got nothing bad to say about it other than it's a bit pricey in my opinion.

THE DEALER WHO SERVED ME ONLY SENT ME 1 BOTTLE WHEN I ORDERED 2. I SENT A MESSAGE EXPLAINING THE SITUATION, BUT THEY SAID THAT THEY SENT 2, NOT ONE. I JUST GAVE UP, I WILL KEEP BUYING FROM AMSOIL ANYWAYS, JUST ONE BAD SERVICE EXPERIENCE. THAT'S WHY ONLY 4 STARS, BUT GOOD PRODUCT.

put Amsoil in my snowmobile after sitting all summer, perked that 4 stoke into a smooth running machine..

I can not positively say that this has improved my octane rating, however the studies have shown that it will. I do believe it will not harm your engine, it could only improve the quality of fuel you use. I just can’t say if it “improved” my gasoline consumption. I do believe the detergents would help keep fuel cleaner.

I have only used this product 1 time so far. I did not notice much of a difference at first but by time I had used 1/2 tank of fuel I noticed my vehicle more responsive when I stepped on the accelerator and by time I had burnt 3/4 tank of fuel my mileage become notibily improved

I COULD NOT TELL THE DIFFERENCE IN PERFORMANCE AFTER USING THIS PRODUCT. I WILL USE IT AGAIN.

First tank with this, still assessing

Been using PI now for several years. In my wife's previous Ford Expedition (2007 5.4L) she did not buy the most quality fuel all the time. Would add PI at every oil change and could actually tell a difference. I use PI in all our current vehicles as well. Not sure I see the MPG increase that it states, but it does help performance.

No complaints so far, seems to allow my cars to run a bit smoother after using!

Used in high mileage (214,000+) Camry that had become sluggish. Noticed added pep to vehicle.

Helped to lower the exhaust tick I had. Less ticking sound from a 200004km 2.0 mivec engine.

Use this in our Camry LE every 2000 miles or so Increases mpg and engine runs smoother

Tried this product on a whim and it worked great! Enough so that I purchased multiple bottles of it again.

Used this on a road trip at the first fill up and got even more mpg’s.

A+awesome