Do fuel additives really work?
Fuel additives are like the Oil discussion... opinions are many and varied.
Yes, I use additives 100% of the time and yes, it warms the cockles of my heart..

BUT... that doesn't mean they are necessary for anyone else or that I am pushing them on anyone.
Yes, I believe they work, especially for me who lives in a northern part of the country where it gets cold and where condensation CAN be issue when the warm fuel in the tank cools off in the cold winter months.
Another thing to think about, if you take care of moisture in fuel or water, microbes cannot grow in the fuel because they need water to grow and start to flourish in the fuel, and the presence of water promotes microbe growth.
@Painted Horse brought up many good points
It's all about staying on top of the fuel and filter maintenance, knowing what you're buying, and what is your comfort level to design what your plan will be with fuel purchased and potential fuel additive use.
Another thing I have read about fuel additives is that for petroleum based additives, they cannot be a fuel system cleaner and lubricity adder at the same time IIRC...
K100 has organic chemistry and contains organic compounds. I'm no chemist but in simple terms, that's what makes it combine with water at the molecular level and allows it to pass through the CP4, to the injectors and into the combustion chamber with zero harmful effects.
But petroleum, or essentially oil, does not play nice with water and does not mix with water, hence demulsification...
So once again, do your own due diligence and research. Use what you feel comfortable with using... all i do is pass on info in a take it or leave it attitude... no harm no foul.
But truthfully, if anyone still thinks an alcohol based additive llke K100 will blow up a CP4, I say unabashedly, that is not true. It has well over 100k miles using K100 in every tank, what's nice about it is you cannot overdose it, and I still have my original CP4 which if the compound containing an alcohol in K100 was harmful, my CP4 would have blown up already.
YMMV...
Last edited by Overkill2; Oct 2, 2024 at 09:57 AM. Reason: correct post
I use an additive to hopefully fix or avoid problems. ie I more apt to use an additive to prevent gelling during cold weather than I am to use it in summer months.
Summer time, I'm usually looking for an additive to increase Cetane and Lubrication. I'm just not sure either of those are measurable. I just hope that adding lubrication improve the chances of my CP4 lasting longer but will it last 150,000 or 200,000. There is no way to measure that.
I don't see an improvement in fuel milage that I can measure. So did the Cetane improvement really help? And my driving varies so much. I can haul a load of horses up over a mountain pass and get 10.5 mpg yesterday, and pull a dump trailer to the gravel pit and get 14 mpg today. Tomorrow and I can drive 100 miles empty and see 22 mpg. so my average for a tank of fuel could be 10.5 or 22 or some average of the combination. I just don't believe I can be accurate with a 50 mile average.
I started using Opti-Lube XPD back in 2008 when Ultra Low Sulfur diesel first came out. In an effort to save some money, I shifted over to Opti-Lube Summer ( which adds lubrication and Cetane at lower cost) I bought gallon jugs of Summer and XPD and they have lasted me a couple years. So I can't speak for other brands.
I do buy my fuel from stations that move a lot of diesel. So I'm not worried about the freshness of the fuel. Utah has a low humidity, So I don't even worry much about condensation in the tank. I've never seen any moisture in the fuel/separator when drain it. I typically drive my trucks about 33,000 miles a year and trade them off every 3 years at 100,000. So I can't give much info on how they held up 200,000 or 300,000 miles.
I have that itch one gets when they are looking to upgrade. While my 2019 Platinum F-450 runs great, it is 5 years old now, 6 according to the build date of 10/18, 3 years left to pay it off, making it 9 years when paid for, it was 4 when I bought it. When I retire in 5 years, do I want an 11 year old truck? So If I were to decide to upgrade to a 2024 truck, I think I will look into one of those side boxes that swing out for storing this stuff.
https://www.kwiktrip.com/our-story/fuel#Diesel
Ford Trucks for Ford Truck Enthusiasts

Maybe they were made for that hard-core metro man that just has to have their crochet needles and yarn *****.
Last time I talked to the fuel manager where I buy it, they get from two different fuel distributors... the fuel is nice and clean. The lower filter always comes out clean looking but I use the K100 every tank which dissolves alphaltenes back into the fuel and it has a fuel cleaner it as well.
Last time I talked to the fuel manager where I buy it, they get from two different fuel distributors... the fuel is nice and clean. The lower filter always comes out clean looking but I use the K100 every tank which dissolves alphaltenes back into the fuel and it has a fuel cleaner it as well.
https://www.bellperformance.com/bell...-busting-myths
And, another good one:
https://www.truckpartsandservice.com...d-and-the-ugly
















