Rislone 4732 Fuel Injector Cleaner with Upper Cylinder Lubricant, 32 oz

8/12/26 - This is the fuel injector to buy. This stuff really works. We were getting a check engine light in our GMC Truck. The code was P0300, which relates to a Misfire. Three GMC service shop could not duplicate nor find anything wrong. These 3-shops cost me - 1st Shop - $348.99 - 2nd Shop was 429.46 - 3rd shop 386.67 Enough, Spent over a $1,100.00 between these shops. But 0ne shop told me I may have a gummed-up injector or 2. That what I said to each of the shop. I have seen this before. So, I started adding this fuel injector cleaner. My 1st and 2nd tank of gas I "Double' the amount of fuel injector cleaner listed on the bottle. Behold after the 1st tank and a 1/4 of the 2nd tank - there were no more codes being set. I will continue using the injector cleaner at a normal rate every time I fill up. As of 8/25/26 have not gotten a single code. Everyone should own a code reader, that way you can delete the old / set c and continue to drive.

Great product! This stuff is helping my truck run great. I live in an area that there is not 1 good fuel station with certified gasoline with cleaning additives. At least not that I have discovered. By adding this product my truck is getting the lubrication it needs and the cleaning agents it requires to keep the injectors plus the O2 sensors healthy. It works and MADE IN THE USA!

Rislone and Bar'sLeaks is one are one of those company's that mostly fly under the radar. They make an excellent preventive maintenance products that work.

Good cleaner but watch the dosage. I put around 4 oz in a 1/2 tank and started getting rough idle and stutter/misfire due to dilution and bad combustion. Once I filled up the tank issues were gone. Just be aware and follow recommended dose.

good stuff

This product works miracles on my ole Cadillac sts 07. She runs smoother and seems to have more pep. Highly recommend this product.

So it’s a little more viscous than Lucas fuel treatment and was priced well but after 2 32oz bottles and thousands of miles my mpgs did not improve. The engine appeared to run a bit smoother and acceleration was a bit better but that extra oomph disappeared after the first tank.

This product works keeping injectors and othe vital components clean from carbon. This is critical if you’re not using top tier gasoline that has the appropriate detergents. I use when I can’t find top tier gasoline.