Gumout 510011 Multi-System Tune-Up, Fuel Stabilizer Injector Cleaner & Gas Treatment, 16 oz, Full Fuel System Cleaner - Improves Engine Performance, Cleans & Removes Deposits and Residue (Pack of 6)

This is the only product I’ve found that has enough P.E.A. to clean and prevent the excessive carbon buildup that the Mini Cooper turbo engines are notoriously known for. I run a full bottle through the gas tank just before each oil change and use a third of a bottle in the gas tank at each fill up for maintenance in between oil changes. I have a 2010 Mini Convertible & a 2014 Countryman. Keeps both cars running like new.

Best to use every 6 months, sooner or later. Then change oil as the engine's carbon residue settle inside the engine after using Gumout. It is more highly recommended if your car is really old and not driven all the time. Do not wait to change your oil based on mileage but based only on time like 6-8 months after the last oil change. The oil scum settles at the bottom of the pan reservoir that needs to be drained at once to prevent oil sludge build up causing friction to the moving parts of the engine.

If your fuel-injected vehicle is running just a touch rough (or worse), try a can in a tank and see if it makes a difference. I've used it on two different motorcycles, a diesel pickup, and a gas powered '91 Corvette and a 2014 Escape. All of them ran smoother after a tank. Modern gas is crap, meant to be used up, and most of it lacks addititives that help keep your fuel system clean. This stuff has PET, which is a solvent that eats up fuel deposits and carbon deposits and will clean your fuel injectors and your engine cylinders of deposits while the engine runs. I find I get the best results when I run it with a full tank of ethanol-free 'pure' gas... empty the can into a near-empty tank then fill it up.

I use this in the oil of engines soon before an oil change and in the gas tank. I can definitely tell a difference in performance. If my grass is very tall, I spike the fuel in the tractor with a little and it cuts much better. $7 or $8 a can at Walmart. Ordered the six pack off Amazon for slightly less per can before, but it’s almost 3x that price now. Must be hitting up those subscribers for the big bucks hoping they won’t notice.

Definitely feel the difference! No more sluggish acceleration and Definitely worth the money good quality stuff in a can.. notice better mpg

Been using multi system tune up for years. Kia manufacturer requires a fuel treatment every oil change and this has been the one I use. 140k on my 3.3L and no issues.

I use it to hold signed pool cue balls and is a great fit. Only thing I world change is the ability to get a really good seal on it without having to use some kind of glue.

I've seen many youtube videos on validation of this product and pretty much all of them have this rated as a top contender, but with the BEST value of them all. On a long trip from CO to NM, I put a can of this into my Kia Rio (I take this trip to my parents house about 6 times a year, thus my gas miser Kia Rio) and mileage increased from a regular 39 MPG to a 46 MPG. Coming back to the Springs, it went up to 48 MPG. I will be putting this stuff into all my vehicles at least twice a year....pays for itself!!!