Hot Shot's SecretLX4 Lubricity Extreme 32 Fl Oz Bottle, Clear, Yellow Liquid, (LX432Z)

Prevent the disco party. At this price it’s cheap insurance. I never fill up without it.

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

Hotshot secrets puts out great products and I have used just about every one so far. I use the LX4 product mostly in my VW jetta TDA as it has a CP4 high pressure pump that is known to go bad without proper lubrication in US diesel! Works great and havnt had any issues so far. Lasts a while when treated at recommended treatment levels!

Best stuff on market if you have a truck with a cp4 you should be adding this to every single tank!

I use this in a 1997 Ford F150, a 2022 F250, 2016 Ford Explorer and a 2019 Ford Edge. Purchase this by the gallon jug. Will not be without it. Vehicles run so much smoother. From start up on -15 below mornings (all but three vehicles sit outside) to running down the Interstate at 80 mph. You notice the difference. A lot of gas stations have alcohol in their gas up to 20% (pump says 10% but law allows more and sometimes that alcohol separates out in the in ground tanks). That alcohol burns just fine, but today's engines need a little protection from what is being delivered at the pump.

If it keeps my cp4 fuel pump functioning and prolongs the life of my vehicle, I will be one satisfied customer.

If you’ve got a 10-16 D-MAX, you should already know the situation with the CP4 fuel pump. The diesel in the U.S. doesn’t have the lube in it like the old days due to emissions. The fuel is too dry and the pumps are “Grenading” on people. I use a lot of Hot Shot’s Secret products on my truck without any issues. I mix this with the HSS Everyday Diesel additive at every fill up. It’s a phenomenal product and well worth every penny you spend on it. If you have any questions, contact HSS website and it will get you where you need to be for an answer. I’ll keep using this until something better comes along. Until then, best of luck.T.H.

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