Hot Shot's SecretLX4 Lubricity Extreme – 16 Fl Oz - Fuel System Protection – Lubricates and Protects Fuel Pump and Injectors – Prevents Wear and Damage – For Gasoline or Diesel Engines

I use all of the Hot Shots products. This is the best. It surprises me how many people are unaware of it. You can test this against any other and be satisfied with the results.

My fuel injectors are 22 years old, and have received a lot of tlc to keep them going strong over the years. The fuel pump is not quite as old but could definitely benefit from this. I had it go bad once and it was a nightmare pump to replace, and pricey. I’m hoping this stuff will provide some cheap insurance. I love the company, they make some great products. This is simply a solvent free high quality oil. Ethanol removes lubricity from your fuel so this is a great way to replace it. After running it through the fuel system for a few hours, I’m noticing the engine runs a bit smoother at a slightly higher rpm at idle. I was also getting a recurring lean engine code intermittently that hasn’t come back since I started using this stuff, fingers crossed.Update: definite improvement in gas mileage! Went from 17mpg to over 20

Fast shipping arrived in great conditions packaged for well

So far it’s worked pretty well

My 2001 Silverado HD has a 100% stock 6.6L LB7 turbo diesel, manufactured before ULSD regulations were promulgated for the United States in year 2007. For years, my engine has had an idle lope, and which recently upon fill up at a Chevron-branded station became more pronounced and was accompanied with a steady blue smoke plume from the exhaust. I suspected that the fuel pressure regulator was not moving smoothly enough and causing the fuel rail pressure to bounce around outside of target values. Since ULSD does not have the lubrication properties of pre-ULSD fuel, I wanted to try a lubricity additive, beyond the Power Service Diesel Kleen I have used since day 1. So I bought a bottle of this Hot Shot's Secret LX4 Lubricity Extreme, and added 5 ounces to my 34 gallon fuel tank that was full. I allowed it to sit overnight, and ran the truck in park for 10 minutes the first day, then let it soak again overnight. I ran it again for 10 minutes the next day in park, and let it sit overnight. The third day I drove it. The surge was totally gone and replaced with a beautiful smooth steady idle, and the blue tailpipe smoke was also gone. The exhaust from the tailpipe is now totally invisible. It's my belief that the pre-2007 Duramax engines were not engineered for the lower lubricity of modern diesel fuel, and for me, this has product is a huge blessing. (I do think the major fuel manufacturers like Chevron are meeting formal lubricity standards, but not to the lubricity level that the Duramax design engineers had in mind in earlier years pre-2007). Unless something changes, I'll use it from now on in my Silverado. Terry Livingston, Mobile, AL

This product puts the lube abilities back into diesel fuel so that sleeves and injectors don’t fail prematurely, a must use product that at this time is the best product available

The container came without a cap. The box was sealed correctly and I checked multiple times collapsing the box flat. So glad the product didn't leak or the seal break completely.

This was a replacement bottle and it arrived with globs of light-colored goo floating around inside. I learned from the company that when subjected to freezing temperatures in it's undiluted state (i.e. in the bottle vs. in 30 gallons of diesel fuel) the organic oils can essentially gel. I brought the bottle inside and in a few days all the organic oils went back into solution. Once they disappeared, I put the bottle back in the much colder garage and it looks just like a normal bottle of LX4. Apparently it must be subjected to very cold temps to bring the organic oils back out of suspension. Anyway, they were very quick to replace the original bottle and all is well!! Thanks Hot Shot's Secret!

Hi. If you live in a cold climate think about buying the winter anti gel vesion. My bottle was frozen at -10c. Yes I know my fault for not reading the label but it didnt cross my mind...

Super product