I drive a 2018 Ram 2500 Cummins as my primary towing vehicle. After comparing five fuel additives across 80,000 miles, here are the five that delivered measurable benefits.
Quick Comparison
| Product | Function | Best For | Rating |
|---|---|---|---|
| Stanadyne Performance Formula | All-in-one | Best Overall | 4.8/5 |
| Power Service Diesel Kleen +Cetane | Cetane + Lubricity | Best Value | 4.7/5 |
| Hot Shot’s Secret Diesel Extreme | DPF cleaner | Best DPF | 4.6/5 |
| Power Service Diesel 911 | Anti-gel emergency | Best Cold Weather | 4.7/5 |
| Howes Diesel Treat | Lubricity + anti-gel | Best All-Season | 4.6/5 |
1. Stanadyne Performance Formula - Best Overall
Stanadyne Performance Formula is the all-in-one diesel additive. Cetane improver, lubricity additive, detergent, water separator, and anti-gel in one bottle. Stanadyne manufactures diesel injection systems - they understand what damages them. Manufacturer-approved by John Deere, Detroit Diesel. After 4 years of using in my Cummins my injectors still work as new despite 80,000 miles. Use every tank in winter, every 3-4 tanks otherwise.
2. Power Service Diesel Kleen +Cetane - Best Value
Power Service Diesel Kleen atcurrent pricing for 64 oz (treats 500 gallons) is the value pick. Boosts cetane rating 4-6 numbers (significant). Lubricity additive. Cleans injectors. White bottle for summer use; gray bottle (anti-gel formula) for winter. Excellent value for what it delivers.
3. Hot Shot’s Secret Diesel Extreme - Best DPF
For trucks with DPF filter issues (excessive regen cycles, MIL lights), Hot Shot’s Secret Diesel Extreme provides aggressive cleaning. Use every 5,000-10,000 miles as part of maintenance. Active ingredient breaks down carbon deposits in DPF and EGR system. Trade-off: more aggressive than general additives, only use as needed.
4. Power Service Diesel 911 - Best Cold Weather
Power Service Diesel 911 is the emergency formula for gelled fuel. If your truck won’t start in extreme cold (below -10F) and you suspect fuel gelling, Diesel 911 dissolves wax crystals and gets you running. Keep a bottle in the toolbox during winter. Preventive use: gray-bottle Power Service Diesel Kleen in winter formula.
5. Howes Diesel Treat - Best All-Season
Howes Diesel Treat combines lubricity + anti-gel + water demulsifier in single formula. Works year-round. Howes guarantees no gelling when used as directed - manufacturer offers tow reimbursement if you gel after proper treatment. After 80+ years on the market, the brand has earned trust.
How to Choose
Match additive to situation:
Cold climate (below 20F regularly): Anti-gel additive every fill. Power Service Diesel Kleen +Cetane (gray bottle) or Howes Diesel Treat.
Hot climate / mild winters: Cetane + lubricity. Stanadyne Performance Formula or Power Service Diesel Kleen (white bottle).
DPF problems: Targeted DPF cleaner periodic use. Hot Shot’s Secret Diesel Extreme every 5-10k miles.
Older diesel (pre-2007): All-in-one focusing on lubricity. ULSD removed sulfur that lubricated injection pump. Older injection systems need lubricity supplements.
Newer diesel (2017+): Modern emissions systems require compatible additives. Verify “EPA registered” or specific manufacturer endorsement.
Cetane Rating Explained
Diesel fuel sold in US has cetane rating 40-45. Cetane affects ignition timing - higher cetane = better cold start, smoother running, less smoke.
Cetane boosters add 4-7 numbers to baseline. The improvement is most noticeable in cold weather starting and at idle.
For high-mileage or hard-working diesels, cetane boost is genuinely beneficial.
Cost vs Benefit
Premium additives: per gallon of diesel. For a Ram 2500 burning 1,500 gallons/year, that’scurrent pricing in additives.
Benefits:
- Extended injector life ( to replace)
- Reduced DPF replacement frequency ( to replace)
- Better cold start reliability (battery life, no boost from tow truck)
- 1-2% fuel economy improvement (covers about half the additive cost)
For trucks driven 15,000+ miles/year, additives pay back in extended component life.
What Doesn’t Help
Gas station “premium diesel”: Usually just standard ULSD at higher price. Look for additive-formulated premium diesel (Shell Diesel Premium with specific formulation) or skip premium diesel and add your own.
Engine cleaners marketed for diesel: Most are designed for gasoline engines. May damage diesel emissions systems. Use only diesel-specific additives.
Generic “diesel injector cleaner”: Often contain low-quality detergents that don’t address the actual challenges of modern diesel (cetane, lubricity, water separation).
My Routine
- Year-round: Power Service Diesel Kleen +Cetane (white bottle) every 3-4 fills
- Winter (below 30F): Switch to gray bottle anti-gel formula every fill
- Every 5,000 miles: Hot Shot’s Secret Diesel Extreme for DPF maintenance
- Toolbox kit: Power Service Diesel 911 in case of gelling emergency
Annual cost: in additives. Cost-justified by:
- 4 years of trouble-free injector operation (avoidedcurrent pricing+ injector service)
- No cold-weather starting issues despite Wyoming winters
- DPF still working as new at 80,000 miles
Common Mistakes
Over-dosing: More additive isn’t better. Follow label directions exactly. Over-treatment can cause its own issues.
Cheap unbranded additives: Untested formulations can damage emissions systems. Stick with established brands.
Skipping cold-weather treatment: Gelled fuel can require tow truck and shop intervention. in additive preventscurrent pricing+ in trouble.
Using gasoline additives in diesel: Different chemistry. Will damage diesel injection components.
Treating low-quality fuel doesn’t fix bad fuel: Get fuel from high-volume reputable stations. Cheapest fuel from low-traffic stations often has water and microbe contamination beyond what additives can fix.
Frequently asked questions
Do diesel additives actually work?+
Yes for specific functions: cetane improvers (better cold start), lubricity additives (offset low-sulfur fuel lubrication loss), water separators (prevent fuel system damage), DPF cleaners (extend regen intervals). 'All-in-one' additives are diluted versions of focused products.
How often should I use them?+
Cetane and lubricity boosters: every tank fill in winter, every 3-5 tanks in summer. DPF cleaners: every 5,000-10,000 miles. Anti-gel: every fill below 0F. Water separator additive: every fill in humid areas or every 10,000 miles otherwise.
Cost vs benefit?+
Premium additives costcurrent pricing per gallon of diesel. Forcurrent pricing, the cold-weather starting and lubricity benefits typically pay back in extended injector life and fewer expensive repairs.
Will they damage modern emissions systems?+
Reputable brands (Stanadyne, Power Service, FPPF) are emissions-system safe. Cheap untested additives can damage DPF, DEF systems, or SCR catalysts. Verify EPA registration and modern emissions compatibility before use.
Do I need them at all?+
Modern ULSD diesel + properly maintained vehicle: maybe not. Cold climates, frequent short trips, high-mileage trucks, or older diesels (pre-2007): yes, additives extend system life.