SKU: 93306445412

SWEPCO | 501 Diesel Fuel Improver | Cetane Booster | Multi-Function

Sale price$95.00 Regular price$105.56
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Shipping Estimate
USA
  • USA
  • CAN

Ships within 48 hours · Estimated delivery Aug 27 - Sep 1

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For Your Every Summer RSVP, with Code: SUMMER15

Description

SWEPCO | 501 Diesel Fuel Improver | Cetane Booster | Multi-FunctionBOOST COMBUSTION, CLEAN INJECTORS, FIGHT DIESEL DEPOSITS SWEPCO 501 Premium Diesel Fuel Improver is a powerful multi function additive designed to restore performance and protect today's diesel enginesespecially when running low quality or ultra low sulfur diesel fuels. It increases cetane for smoother, quieter combustion, reduces emissions, and protects injectors from wear and fouling. Whether you're managing over the road trucks, agricultural

BOOST COMBUSTION, CLEAN INJECTORS, FIGHT DIESEL DEPOSITS

SWEPCO 501 Premium Diesel Fuel Improver is a powerful multi-function additive designed to restore performance and protect today's diesel engines—especially when running low-quality or ultra-low sulfur diesel fuels. It increases cetane for smoother, quieter combustion, reduces emissions, and protects injectors from wear and fouling. Whether you're managing over-the-road trucks, agricultural equipment, or off-road fleets, SWEPCO 501 keeps your diesel systems cleaner, longer, and running more efficiently.

Key Features:

  • Raises Cetane Numbers: Boosts ignition quality for quicker starts, smoother acceleration, and more complete combustion—especially in cold weather.
  • Cleans & Protects Injectors: Keeps injectors clean and removes existing deposits for better spray patterns and fuel efficiency.
  • Reduces Emissions Up to 42%: Independently tested using opacity methods—cleaner fuel burns mean cleaner air.
  • Minimizes Wear from ULSD: Reduces abrasive injector and pump wear by up to 26%, countering the low-lubricity of ultra-low sulfur diesel fuel.
  • Winter Formula Available: Improves cold flow and prevents gelling during cold starts and sub-freezing operation.

Performance Benefits:

  • Improves ignition quality in any diesel fuel
  • Improves fuel economy and reduces fuel-related maintenance
  • Reduces smoking, misfiring, knocking, and starting issues
  • Extends injector and pump life significantly
  • Enhances fuel storage stability and system cleanliness

Markets Served:

  • Over-the-Road Trucking & Fleets
  • Agriculture & Farming Equipment
  • Marine & Dockside Operations
  • Heavy Construction & Industrial Vehicles

Common Applications:

  • All diesel engine types: mobile, stationary, turbocharged
  • Fleet vehicles, long-haul rigs, school and transit buses
  • Tractors, harvesters, and other farm equipment
  • Mobile construction and off-road diesel machinery
  • Diesel-powered generators, cranes, compressors

 

CLEANER FUEL. QUIETER COMBUSTION. FEWER BREAKDOWNS.
RUN SWEPCO 501 AND KEEP YOUR DIESEL DIALED IN.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 93306445412

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4.6 ★★★★★
Based on 21 reviews
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Cindee
Chelsea, US
★★★★★ 4
Nice cozy sweater, but handwashing is recommended
Color: Beige, Size: Medium
Soft and cozy, but does not wash well. Goes with everything. This sweater fits well and looks great. I received lots of compliments while wearing it.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 23, 2026
H
Verified Purchase
Hillary K
West Palm Beach, US
★★★★★ 5
Great sweater for winters in the Midwest
Color: Black, Size: X-Large
Love this sweater! I went back and got another color! The fit is true to size and very comfy. The button detail on the sleeves just adds a little pizazz. The weight of the sweater is perfect for winters in the Midwest.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 30, 2026
K
Verified Purchase
KatieMae
Pawtucket, US
★★★★★ 5
Flattering fit
Color: Dark Green, Size: XX-Large
This sweater is thick and stretchy but holds a nice shape, and is flattering on the body. The sleeves are nice and long too, which I really appreciate, being a tall person... the button detail is a great addition. True to size. I haven't washed it yet, and I imagine, based on the kind of woolly knit it is, that this sweater will eventually pill... but for now I'm enjoying being cozy and stylish. The deep green color is almost black green. I LOVE IT.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 2, 2026
G
Verified Purchase
GypsySoul
Lowell, US
★★★★★ 5
Love it
Color: Dark Green, Size: Small
I got the dark green. Love the sweater and it's warm. I do layer the sweater as well. It is as pictured. Size is perfect to me. I like sweaters to be longer and a bit wider in case it is freezing and I need to layer it. This sweater is perfect for layering. It comes closer to my backside, it is a little wide and not snug, and I like that the sleeves come over my wrists
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 7, 2026
J
Verified Purchase
JB
Phoenix, US
★★★★★ 1
Still soft but looks terrible after 1 wash. Save your money
Color: White, Size: Small, Color: White, Size: Small
Update: sweater looked great when I received. After 1 wash it looks terrible. Looks like it’s been washed too many times, material fuzzy and piled. After wearing it once, it snagged and the knit pulled through. I would NOT recommend. I had such high hopes. Save your money. Very nice sweater, especially for the price! I love the details of the buttons on the sleeves. It is SO soft. It’s not super thick as I can see my skin through it when pressing my hand up against fabric. However, it’s not see through when wearing it. It’ll be perfect in cooler weather and perfect in the winter with a coat but won’t cause me to overheat when in a heated environment. I do feel like it runs big. I could have sized down a size. Although I’m not sure if it’ll shrink after a wash or two.
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Reviewed in the United States on September 22, 2025

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