Product Reviewed: P.I Performance Improver (API)
Current Rating: 4.91 out of 5 stars
Votes & Reviews: 371 vote(s) and 230 user reviews.
Reviewed by Ryan the lion: 
I purchase PI, every oil change. I feel that my 2010 Tahoe dose benefit from this fluid as it's high in mileage and the environment here is harsh for any vehicles. I really don't see any fuel mileage increase, but it's the engine is running smoother in the cold mornings.
It's a nice treat for the "Tank".
Reviewed by Rich:
I used this in one of my older high mileage cars and it seemed to really do what it was intended. I will use this again and probably even in the newer ones.
Reviewed by Hank:
Been using for years. Keeps moisture out and clean injectors
Reviewed by rooroo:
Great product
Reviewed by Dan:
This product works very well and I like using it, however it is expensive which limits my ability to purchase more and use it more ofter.
Reviewed by Dan:
This product works very well and I like using it, however it is expensive which limits my ability to purchase more and use it more ofter.
Reviewed by JMC:
Seem work good additive pi performance gasoline additive with 93 fuel noticed much more effective clean more deep work as great
Reviewed by ironrail:
I use this product every time that I change the oil on my vehicles. I drive about 1000 miles per week so I change my oil frequently. It does what it says that it does. i wish it were already added to the gas at the pumps. My vehicles run as smooth as silk.
Reviewed by John R:
Used this product many times at every oil change all but good results.
Reviewed by Mark W:
I just completed my second try of P.I. I didn't notice any change during or after my first tank and waited for another oil change before trying it again. On the second use I did notice a change in mileage and the engine did seem to run smoother. I will continue to use as directed.
Reviewed by Mix:
Works as stated
Reviewed by Gas addative:
I use PI gas sedative in all 3 of my vehicles plus lawn mower and snow blower helps keep carbon down.
Reviewed by Jbush0202:
Once a month you will tell a difference in all aspects,of car ownership
Reviewed by Patch:
I am amazed at the difference in my pickup every time I use this. I use PI twice a year. once when I do my oil change, and again 6 months later. I notice a smoother idle, a small increase in MPG and a boost in power. It is not huge, but enough to know I have used the PI, and that it is working.
Reviewed by Patch:
I am amazed at the difference in my pickup every time I use this. I use PI twice a year. once when I do my oil change, and again 6 months later. I notice a smoother idle, a small increase in MPG and a boost in power. It is not huge, but enough to know I have used the PI, and that it is working.
Reviewed by 4Runner:
Best product ever thanks
Reviewed by AMSOILfan:
I use the PI in the fuel system on every 4 stroke engine I have. It noticeably keeps them running smooth and at peak fuel economy. This was evidenced after pulling the fuel rail off my truck, which had 15 years of daily use at that time, to change intake manifold seals. The fuel injector nozzles were completely clean!
Reviewed by Vinny m:
I have been using amsoil now for about 8 months in my cars and motorcycles and I love it works very very well and it is a high quality product
Reviewed by Hippie:
I use P.i. in my daily driver every few months. It makes my engine run smooth and it feels peppier! My only complaint is it's a little pricey. I'm hooked though, Customer for life!
Reviewed by Bear:
I have used the P.I.Performance in several cars and trucks of all ages. P.I. will help keep the fuel system clean and increase Horse Power and Mileage
I have
recommended this product to friends and relatives and they have all agreed its a great product and will continue to use it..
Reviewed by Wildkatt1966:
I have using Amsoil since 1979 in all my vehicles. I had a 1981 Toyota 4X4 SR5 that I used Amsoil from day one. I had to rebuild the tranny at 30K & 60K miles (no fault of Amsoil-Toyota used a Celica tranny that was very underrated for the 4X4). When I removed the parts the syncos and gears looked like new. The main problem was the input bearing was to small and chewed itself up at 30K and 60K miles.
Never bought another Toyota since they would not honor their 30K warranty.
Reviewed by Rj:
Put this in all of my cars and they got better gas millage.i recommend this product to all of my friends
Reviewed by Sam:
Great product and gives your vehicle a clean out and a mileage boost.
Reviewed by Chief Worm:
I used this on a company car that only drove short distances around the work site (Orlando Airport). I used this product on my personal car and liked the results so I used it in this company car and WOW!!! The results were phenomenal. No more rough starts. No acceleration lag. It was like a totally new car.
Reviewed by Paul:
I use this product every other month and it keeps all my vehicles running great.
Reviewed by Just Rick:
I use this product to keep the fuel injectors in my Honda Fit clean. It seems to improve the fuel mileage and restores the power that is lost because of the poor quality fuel on the market today.
Reviewed by BUCK:
WORKS GOOD, ALL MY TRUCKS RUN FINE. PUSHING 248k MILES ON MY '98 CHEVY. TRY QUICKSHOT FOR YOUR SMALL ENGINES, PUT IT IN THE GAS CAN WHEN YOU FILL UP, REALLY CLEANS UP LAWN MOWERS AND CHAINS SAWS, THEY RUN SO NICE.
Reviewed by Tyson:
I put Amsoil in everything I own. I found that my vehicles and equipment last longer and perform better. My vehicles gfet better MPG, and handle all kinds of wear and tear.
Reviewed by Sparky:
Excellent
Reviewed by Bigred:
I like this product I use it fir cleaning the fuel systems and can tell a big difference.
Reviewed by Husbandly Car Repairer:
Wifey left her flagship Mercedes Benz unused for a long time and the engine was really rough. I poured in 2 oz per tank until the idle was smooth. I recommend putting a little in at a time in case injectors get plugged with a whole bottle. So start slow for the first tank and then increase. Lovely stuff.
Reviewed by SAABGUY:
Great Product,Probably The Best.Wish AMSOIL Cut One A Break On Shipping!
Reviewed by Tbone:
Have used this product for years have never had any fuel system problems.
Reviewed by Big red:
I like this product I use it fir cleaning the fuel systems and can tell a big difference.
Reviewed by Curt:
I use this in all of my vehicles, but I really know it works when I had a motorcycle that was used very little. The carbs were gummed up and it wasn't running right. I really didn't want to tear the carbs apart, so I ran a few tankfuls of gas with PI in it through and it cleaned up the carbs. The motorcycle now runs right!
Reviewed by Nuts and bolts:
Install this in your gas tank and your milage might just incress .
Reviewed by Big z:
I've used amsoil ever since I bought my car new. And the fuel injector cleaner joined with the oil has kept the car running great and like new.
Reviewed by Clint:
I usually use Lucas but now I'm forever switching to the performance improver. I have used this in my motorcycle and my car. When using this with regular gas with 10% ethanol in it I usually see an increase in my dodge dart from 31 mpg to 34 mpg. When using it with regular ethanol free gas i get 39 mpg. In my motorcycle i only use ethanol free premium gas and see an increase from 50 mpg to about 58 mpg.
Reviewed by Hikerman124:
The name says it all, "Performance Improver Gasoline Additive"! It does exactly as the name says, it has improved the power and responsiveness of all my vehicles and toys and improves mileage as well. I got the second best mileage that I ever gotten in my Tacoma truck after adding a full bottle to a tank of gas. And that's despite driving 10-15 km/hr. faster than I normally drive with a 40-50 km/hr. head wind over a 5 hr driving period. The only time I got better mileage was with a 60 km/hr. tail wind and driving 25 km/hr. slower.
Reviewed by Big D.:
I use this in my 2003 Ranger Ford & my 2003 Explore. It keeps my intake clean and gave me more horse power too.
Reviewed by Big D:
I use this in my 2003 Ranger Ford & my 2003 Explore. It keeps my intake clean and gave me more horse power too.
Reviewed by Trevor:
I think Amsoil make top of the line products. I use this product in my vehicles every 4 to 6 months.
Reviewed by Eyhab:
Fantastic
Reviewed by Chguck:
If used as directed it does a great job
Reviewed by BAC:
Use this on both my vehicles every 5,000 miles and it seems to help keep injectors clean, running smoothly with smooth idling.
Reviewed by Rich:
motors that don't get used much put PI in smooths right out.buy it
Reviewed by Lineman:
This added 2 plus mpg, I really don't care about that, I want smooth running and clean burning
Reviewed by Hector:
Good product thanks amsoil
Reviewed by Jonesy:
I put a bottle of this in my 2005 Chevy Avalanche every 5000 miles and between that and Amsoil Signature Series oil I use I have over 200,000 miles and it is still going strong!!
Reviewed by Iceman139:
I am not sure if the product actually does much to improve the fuel mileage of my 6 cylinder Chrysler 200 but it does seem to run smoothly . I just use it when I change my oil and filter to help keep the fuel injection system clean. I figure if I'm gonna put in clean oil.and filter, might as well clean fuel system too!
Reviewed by Iceman139:
I am not sure if the product actually does much to improve the fuel mileage of my 6 cylinder Chrysler 200 but it does seem to run smoothly . I just use it when I change my oil and filter to help keep the fuel injection system clean. I figure if I'm gonna put in clean oil.and filter, might as well clean fuel system too!
Reviewed by
pete:
WORKS VERY WELL
Reviewed by San Diego:
Used in a Scion tC, cleaning agents inside work very effectively. Can feel power being restored to the car over the course of the tank of gas. I use 3/4ths a bottle every 5000 miles to make sure everything is clean and pristine.
Reviewed by Crimefighter:
My Honda Accord, EX-L had a hesitation problem for some time. I tried other additives that did not work. When I tried Amsoil Gasoline Additive it worked and is still working. Next treatment is at 4000 mile after first use.
Reviewed by Mario:
Love this product and I do use the P.i. performance improver gasoline additive every 3 thousand miles. Do recommend.
Reviewed by Gmcfanboy:
Had a slight hesitation after shifting into 2d gear for the last year. Added bottle to full tank of gas and by a 1/2 tank the hesitation was gone and has remained gone.
Reviewed by Kipster:
Am using this stuff every oil change. Will update as I go
Reviewed by Champion200:
I use P.i. every 5000 miles because it's easier to track that frequency on my odometer. I have over 130,000 miles on my 2007 Silverado and have experienced zero fuel injector problems.
Reviewed by Falcon:
Occasionally I pull a plug from my engines and use a bore scope and check the combustion chamber.
Valves and pistons are carbon free thanks to this excellent fuel additive.
Reviewed by Barry:
Add a bottle of P.I. to the tank of our 2011 GMC Terrain V6 every 5000 miles since new. Now have about 134,000 miles and it runs better than new. I am really amazed at how smooth it runs and the gas mileage is the same now as it was when new. I use P.I in my H-D motorcycle and for the all the motorized lawn and garden equipment. My 23 year old lawn tractor still runs like a top; Amsoil in the crankcase and P.I. in the tank.
Reviewed by Viper6:
I use it in my car, truck, motorcycle, lawnmower, chainsaw, trimmer, blower.
Reviewed by J. Ras:
I drive about 5000 miles per month. Once a month I use the PI and can hear, feel the difference.
Reviewed by Bruce:
Gas was slightly contaminated AMSoil straightened it all out.
Reviewed by Blake:
I put this product in everything from my lawnmower equipment to my motorcycle to my turbo daily driver. I can see the improvement in fuel economy and the engines just run smoother. Also my lawn equipment's fuel system doesn't seem to get gummed up as often.
Reviewed by Kevin:
I can tell a huge difference in my cars . Most other products I can not. I love Amsoil products!
Reviewed by Boostedwrx:
Great product love the performance and protection I getting from additive
Reviewed by
Desrah:
I looked forward to using this product every 4500 miles in other to help maintain a clear and clogged free fuel line and filter system.
Reviewed by Desrah:
I looked forward to using this product every 4500 miles in other to help maintain a clear and clogged free fuel line and filter system.
Reviewed by Gaby:
I purchased this product for my 2010 Honda Accord with the 3.5L VTECH engine on it. It is my daily driver and work vehicle. I do not not exactly what's my MPG's since the vehicle does not have the feature but I can tell you that I am using one quart of gas when before I was using half tank of gas in one week period just going and coming back from work. Also it is city driving. Loved the product.
Reviewed by Tony:
Satisfied with the purchase, but since I do a lot of city driving and fuel up every 2 days, not really sure if I improved my mileage.
Reviewed by Tony:
Satisfied with the purchase, but since I do a lot of city driving and fuel up every 2 days, not really sure if I improved my mileage.
Reviewed by Jams:
I tried this product just this one time on a trip. I give it five stars because I was satisfied with it although I would need more time to fully test it.
Reviewed by Jalms:
I tried this product just this one time on a trip. I give it five stars because I was satisfied with it although I would need more time to fully test it.
Reviewed by
Dave:
Used this priduct to clean fuel system on our Nissan Rogue. Instead of just 28mph, we now get 33mph.
Reviewed by mcf:
Whenever I'm off on a long trip I use this product and am now close to 200,000 kilometres and 10 years of use without any engine problems at all. My Toyota Tundra pickup is running like new.
Reviewed by mcf:
Whenever I'm off on a long trip I use this product and am now close to 200,000 kilometres and 10 years of use without any engine problems at all. My Toyota Tundra pickup is running like new.
Reviewed by Ron from Kentucky:
Adding this is as simple as it gets. My runs like it was new and the gets the gas mileage like it to. A bottle every 3 months works the best for me I'm my Ford Focus. Totally sold on this stuff.
Reviewed by Rollin:
I used this product on my 01 lexus es300 at the begining of this year, and saw almost instant increase in lost power and accelaration reaction time. since then I've used it twice and everytime, Especially when used after or before using quickshot, my car always responds like new and my engine feels clean and responsive. It helps that I use only shell gas as well.
Reviewed by Dave:
I use this in my Ford car once or twice a year to clean the fuel system.
Reviewed by Singer of Songs:
I use this product religiously to keep my fuel system on my 2005 Ford F-150, in the best shape I can.
Reviewed by Randy:
I used it in the gas tank of my Volvo XC70 to help the engine run smoother, it sounded like water might be their, It works great.
Reviewed by Alan:
I recommend Amsoil to anyone that wishes to take the best care of their vehicles. All that have tried the products, are completely satisfied, & they have said no other brand of products would be used in the future. Only Amsoil!
Reviewed by Tom:
Works great
Reviewed by longhaul:
I have used PI twice a year since the car was new and at 240,000 kilometers it idles smooth and has the same driving feel as new. I call that insurance.
Reviewed by tootall:
Use in all my gas powered equipment
Reviewed by mechanic:
PI Performance works great added horse power and increase fuel millage.
Reviewed by Mac:
I use all Amsoil products in both of my vehicles and have for years now. I will not use anything else in any of my vehicles.
Reviewed by HILTY:
IN CAR, TRUCK, MOWERS
Reviewed by Zman:
Improved my gas mileage & performance overall better running engine for sure😎👍🏼
Reviewed by Tim:
The vehicles now a days cost a great deal of money to own and repair so I believe using Amsoil products is good insurance to keep my vehicles running good and avoiding repair costs.
Reviewed by Jake:
I use this product every six months. My 12.5 year old injectors were perfectly clean after inspection. I'd say it works great.
Reviewed by none:
It works.
Reviewed by Silver Hair:
The Performance Improver does just that. I have used it in a Kawasaki, three Hondas, and now an Indian. I can't see it working, but I can sure feel it.
Reviewed by Mark the pipeliner:
I add to all of our vehicles every oil change to help keep the fuel system clean and at it's optimum.
Reviewed by CJ:
I utilize the additive about once q. 3 mo. and I can definitely tell the difference in my wife's '08 Honda Accord 3.5L V-6. The MPG increases on HWY by about 5%! Amsoil should come out with an affordable Ethanol Tx. which counteracts the decrease in MPG/Power of ethanol blend gasoline. We strictly utilize BP gasolines, yet there is still carbon build-up even with the additives they possess. Definitely worth the price to help keep the fuel system flowing smoothly!
Reviewed by Jake:
Makes a dramatic increase in fuel economy
Reviewed by mr jim:
PUT IT IN TWICE YEAR IN A FULL TANK.
AND NEVER HAD A PROBLEM STARTS GOOD
IN ANY WEATHER HOT & COLD WET OR DRY
Reviewed by Butch:
I've used the products and can only hope they work as advertised and from on-line reviews. Right now the jury's still out.
Reviewed by Monk:
This always makes the car run more smooth and better feeling acceleration and general improvement overall
Canada
United States
It's a treat
I purchase PI, every oil change. I feel that my 2010 Tahoe dose benefit from this fluid as it's high in mileage and the environment here is harsh for any vehicles. I really don't see any fuel mileage increase, but it's the engine is running smoother in the cold mornings.
It's a nice treat for the "Tank".