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Loading...Eleven diesel anti-gel additives — Lucas, Howes, Power Service Diesel, STA-BIL, Stanadyne, PEAK, Ford, Amsoil, Opti-Lube, Hot Shot’s Secret, and Archoil — were dosed into half-gallons of ultra-low-sulfur diesel per label instructions and run through the same gauntlet: a lubricity bench test with the wear scar measured under a microscope, 24 hours in a -38°F freezer, an accelerated corrosion test on bare steel, a flammability comparison, and a water-demulsification check. Untreated diesel and two-stroke oil at 40:1 served as baselines. Six emergency de-gel products then raced to re-liquefy containers of frozen fuel.
The scam question gets a split verdict. Additive choice swung the wear scar from 5.17 mm to 9.21 mm against a 9.34 mm untreated baseline — some products transform the fuel's lubricity while others barely register — and nothing kept fuel below cloud point at -38°F, even at quadruple dose. Prevention still beat rescue by a mile: none of the emergency products made meaningful progress on frozen fuel while it stayed in the freezer.
Best Overall
1.6 Average Finish
Average Finish: 1.6
Purchased for: $17
Made In: USA
Lowers pour point down to -65°F. Best average finish in the comparison at 1.6: first in corrosion protection, the best possible flammability rating of 1, a 5.2 mm wear scar, and a top anti-gel rating at -38°F.
Strong in every category: first in corrosion protection, the best possible flammability rating of 1, a 5.2 mm wear scar, and a top anti-gel rating at -38°F — for $17 per 16-ounce bottle.
Runner-Up
The Backup Pick
Purchased for: $17
Made In: USA
Two 16-ounce bottles for $17 with a claimed cetane boost of up to four numbers. Tied for the best anti-gel rating at -38°F and posted a 5.34 mm wear scar — third-best lubricity in the test.
A 5.34 mm wear scar and one of the two best anti-gel ratings at -38°F, at 53 cents per ounce — the pick if Hot Shot’s Secret isn't available.
Best Lubricity
5.17 mm Wear Scar
Purchased for: $45
Made In: USA
3 ounces treats up to 10 gallons, with a claimed pour point down to -44°F. Won the lubricity test outright at 5.17 mm and attacked water beads effectively, but finished 10th in corrosion protection at $45 a bottle.
The smallest wear scar in the test, edging out Hot Shot’s Secret at 5.2 mm — but $45 per bottle and a 10th-place corrosion finish keep it off the top spot.
| Name | Purchased for ($) | Purchased for, Per Piece ($) | Average Finish | Link | Made In | |
|---|---|---|---|---|---|---|
| Hot Shot’s Secret | $17.00 | $1.06 | 1.6 | Search on Amazon | USA | |
Lowers pour point down to -65°F. Best average finish in the comparison at 1.6: first in corrosion protection, the best possible flammability rating of 1, a 5.2 mm wear scar, and a top anti-gel rating at -38°F. | ||||||
| Lucas | $14.00 | $0.22 | Search on Amazon | USA | ||
$14 for 64 ounces, with one bottle treating 300 gallons down to -10°F. Its water dispersants did break down water beads as claimed, but a 9.21 mm wear scar — barely better than untreated fuel — and a last-place corrosion finish hurt. | ||||||
| Howes | $20.00 | $0.31 | Search on Amazon | Canada | ||
Canadian-made anti-gel that kept all of its fuel liquid at -38°F where several rivals froze, though the sample still reached cloud point. An 8.8 mm wear scar puts its lubricity claim near the back of the field. | ||||||
| Power Service Diesel | $27.00 | $0.42 | Search on Amazon | USA | ||
Contains Slick Diesel Lubricator and a cetane-boost claim; a mid-pack 6.83 mm wear scar and a flammability rating of 2 — among the best — but 12th of 13 in corrosion protection. | ||||||
| STA-BIL | $15.00 | $0.47 | Search on Amazon | USA | ||
Treats 250 gallons down to -40°F without doubling the dose — the only brand in the lineup that didn't require it. A 5.46 mm wear scar was fourth-best, and it demulsified water as claimed. | ||||||
| Stanadyne | $32.00 | $0.50 | Search on Amazon | USA | ||
Highly concentrated formula claiming up to 40°F of pour-point improvement, but the treated fuel froze solid at -38°F and the 9.07 mm wear scar was among the worst. It did take third place in corrosion protection. | ||||||
| PEAK | $17.00 | $0.53 | Search on Amazon | USA | ||
Two 16-ounce bottles for $17 with a claimed cetane boost of up to four numbers. Tied for the best anti-gel rating at -38°F and posted a 5.34 mm wear scar — third-best lubricity in the test. | ||||||
| Ford | $11.00 | $0.55 | Search on Amazon | USA | ||
A concentrated formula that requires less product than most brands. A middling 7.83 mm wear scar, and its fuel turned to a slushy mix at -38°F until the dose was doubled again. | ||||||
| Amsoil | $12.00 | $0.75 | Search on Amazon | USA | ||
One 16-ounce bottle treats up to 80 gallons. A better-than-average 6.41 mm wear scar, a flammability rating of 2, and fifth place in corrosion protection make it a solid all-rounder. | ||||||
| Opti-Lube | $32.00 | $1.00 | Search on Amazon | USA | ||
Claims faster engine warm-ups and rust prevention; delivered strong lubricity at 5.72 mm and effective water demulsification, but finished 11th of 13 in the corrosion test. | ||||||
| Archoil | $45.00 | $1.10 | Search on Amazon | USA | ||
3 ounces treats up to 10 gallons, with a claimed pour point down to -44°F. Won the lubricity test outright at 5.17 mm and attacked water beads effectively, but finished 10th in corrosion protection at $45 a bottle. | ||||||
| Hot Shot’s Secret Winter Rescue | $15.00 | $0.47 | Search on Amazon | USA | ||
Emergency de-icer whose 32-ounce bottle treats up to 40 gallons; first to re-liquefy frozen fuel at ambient temperature. | ||||||
| FPPF | $15.00 | $0.47 | Search on Amazon | USA | ||
Claims to re-liquefy gelled fuel in minutes, with each bottle treating 125 gallons; finished second in the thaw race, a few minutes behind the winner. | ||||||
| Power Service Diesel 911 | $32.00 | $0.50 | Search on Amazon | USA | ||
Contains Slick Diesel Lubricator and treats up to 250 gallons; third place in the thaw race, just ahead of Amsoil Diesel Recovery. | ||||||
| Amsoil Diesel Recovery | $16.00 | $ | Search on Amazon | USA | ||
Made to melt gelled fuel quickly and free frozen fuel filters; fourth in the thaw race, barely behind Power Service Diesel 911. | ||||||
| Howes Diesel Lifeline | $30.00 | $0.47 | Search on Amazon | Canada | ||
Alcohol-free emergency formula rated to -35°F and beyond, dosed at 16 ounces per 20 gallons; fifth in the thaw race, and its treated fuel looked noticeably cloudier than the rest. | ||||||
| CleanBoost | $25.00 | $0.78 | Search on Amazon | USA | ||
$25 for 32 ounces; finished last of the six rescue products in the ambient-temperature thaw race, barely behind Howes Diesel Lifeline. | ||||||
Lower is better
Anti-gel prices run from the $11 Ford to the $45 Archoil, and per-ounce cost from 22 cents (Lucas) to about $1.10 (Archoil). Price bought little here: the $17 Hot Shot’s Secret beat everything, while the $32 Stanadyne froze solid at -38°F. Among the rescue products, the $15 Hot Shot’s Secret Winter Rescue outpaced the $32 Power Service Diesel 911.
Wear scar diameter in millimeters after the bench lubricity test — smaller is better
The Archoil produced the smallest wear scar at 5.17 mm, with Hot Shot’s Secret at 5.2 mm and PEAK at 5.34 mm close behind. At the other end, Lucas (9.21 mm) and Stanadyne (9.07 mm) barely improved on the 9.34 mm untreated baseline. Plain two-stroke oil at a 40:1 ratio managed 5.89 mm — better than most of the purpose-made additives.
| Rank | Product | Result |
|---|---|---|
| 1 | Archoil | 5.17 |
| 2 | Hot Shot’s Secret | 5.20 |
| 3 | PEAK | 5.34 |
| 4 | STA-BIL | 5.46 |
| 5 | Opti-Lube | 5.72 |
| 6 | Two-Stroke Oil | 5.89 |
| 7 | Amsoil | 6.41 |
| 8 | Power Service Diesel | 6.83 |
| 9 | Ford | 7.83 |
| 10 | Howes | 8.80 |
| 11 | Stanadyne | 9.07 |
| 12 | Lucas | 9.21 |
| 13 | Untreated Diesel | 9.34 |
Finish order after 24 hours against an aggressive rusting agent on bare steel — lower is better
Hot Shot’s Secret finished first with a large rust-free area and only light, superficial oxidation elsewhere. The sobering result is second place: plain untreated diesel out-protected every additive except Hot Shot’s Secret, meaning most of these products left steel rustier than no treatment at all. Lucas finished last with heavy rust across the panel, just behind Power Service Diesel and Opti-Lube.
| Rank | Product | Result |
|---|---|---|
| 1 | Hot Shot’s Secret | 1 |
| 2 | Untreated Diesel | 2 |
| 3 | Stanadyne | 3 |
| 4 | Two-Stroke Oil | 4 |
| 5 | Amsoil | 5 |
| 6 | Howes | 6 |
| 7 | STA-BIL | 7 |
| 8 | PEAK | 8 |
| 9 | Ford | 9 |
| 10 | Archoil | 10 |
| 11 | Opti-Lube | 11 |
| 12 | Power Service Diesel | 12 |
| 13 | Lucas | 13 |
Finish order re-liquefying frozen fuel at roughly 70°F ambient — lower is better
At the recommended dose, none of the six rescue products made much progress while the fuel sat in the freezer — real-world cold defeats them. Topped off generously at roughly 70°F ambient, Hot Shot’s Secret Winter Rescue finished first, with FPPF a few minutes behind and Power Service Diesel 911 barely ahead of Amsoil Diesel Recovery; most of the field wasn't far apart, though the Howes Diesel Lifeline sample stayed noticeably cloudy.
| Rank | Product | Result |
|---|---|---|
| 1 | Hot Shot’s Secret Winter Rescue | 1 |
| 2 | FPPF | 2 |
| 3 | Power Service Diesel 911 | 3 |
| 4 | Amsoil Diesel Recovery | 4 |
| 5 | Howes Diesel Lifeline | 5 |
| 6 | CleanBoost | 6 |
Hot Shot’s Secret is the clear winner of this comparison, with the best average finish at 1.6 across the test categories. It posted a 5.2 mm wear scar, took first place in corrosion protection, earned the best possible flammability rating of 1 for cold-start friendliness, tied for the best anti-gel rating at -38°F, and broke down water beads as its dispersant claim promises — all for $17 per 16-ounce bottle. PEAK is the backup pick: a 5.34 mm wear scar, the other top anti-gel rating, and two 16-ounce bottles for $17 make it the cheaper way to most of the same protection.
For pure lubricity, Archoil won outright at 5.17 mm — impressive, but $45 per bottle and a 10th-place corrosion finish make it a specialist buy. STA-BIL is the quiet value: $15, a fourth-best 5.46 mm wear scar, effective water demulsification, and the only formula that treats down to -40°F without double-dosing. The results also show why brand choice matters: against a 9.34 mm untreated baseline, Lucas managed only 9.21 mm and Stanadyne 9.07 mm, and the Stanadyne-treated fuel froze solid at -38°F. Ordinary two-stroke oil at 40:1 out-lubricated most of the field at 5.89 mm, though it does nothing against gelling.
Two cautions before buying. First, corrosion: untreated diesel finished second in the rust test, so most additives — Lucas, Power Service Diesel, and Opti-Lube worst among them — actually left bare steel worse off than plain fuel. Second, don't count on rescue products: at -38°F none of the six could re-liquefy frozen fuel at the recommended dose, and the race only resolved once the containers warmed to room temperature, where Hot Shot’s Secret Winter Rescue and FPPF led the way. Doubling the anti-gel dose again helped nearly every brand, with six earning a solid rating of 2, but every sample still reached cloud point — in truly severe cold, treat early and generously, because thawing after the fact barely works.