Our rankings are generated through the algorithmic analysis of thousands of customer reviews about products, brands, merchant customer service levels, popularity trends, and more. We use advanced technology, including AI, to help process and organize this information at scale, supporting our analysis with greater speed and consistency. The rankings reflect our opinion and should be a good starting point for shopping.
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10 Best engine treatments of 2026
Save up to 20% off
Best Choice1
Prolube9.8Exceptional
Prolube Oil Treatment - Engine Oil Additive for Gas & Diesel Engines - Reduces Wear, Noise, Vibration - Boosts Fuel Economy & Horsepower - Works on Transmissions & Differentials (1QT)
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Form Factor:Oil Additive
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Quantity:1QT
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Mixing Ratio:1 oz per quart (standard), 2 oz per quart (heavy-duty/high-mileage)
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Compatible Systems:Transmissions and Differentials
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Compatible Engine Types:Gasoline and Diesel Engines
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Thousands of users trust our site daily- Based on millions of stores and reviews
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Value for Money2
Rislone9.7Exceptional
Rislone 4102 XTREME LUBE® Maximum Performance Engine Treatment, 16.9 oz.
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3
Liqui Moly9.6Exceptional
LIQUI MOLY Oil Additive Cera Tec 20002 Ceramic Wear & Tear Protection for Petrol & Diesel Engines Smoother Engine Performance, Less Friction & Lower Fuel Consumption 300 ml
11% Off
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4
Slick 509.4Excellent
Slick 50 Original Engine Treatment | 32 oz., Single
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5
Liqui Moly9.2Excellent
Liqui Moly Pro-Line Engine Flush | 500 ml | Oil additive | SKU: 2037
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product dimensions: 2.76 x 2.76 x 7.99 inches
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item weight: 15.2 ounces
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oem part number: 2037
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item model number: 2037
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best sellers rank: 654 in Automotive See Top 100 in Automotive 1 in Engine Flushes
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See Today’s Deals & Prices
6
Lucas Oil8.9Very Good
Lucas Oil 10003 Fuel Treatment - 1 Quart
20% Off-
Function:Fuel system cleaning and lubrication
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Primary Benefit:Increases life of pumps and injectors
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Compliance:Federal low sulfur content requirements
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Fuel Type Compatibility:Gasoline and diesel engines
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Volume:1 Quart
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7
STP8.8Very Good
STP High Mileage Oil Treatment + Stop Leak - 15 FL OZ
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product dimensions: 7.22 x 3.65 x 1.85 inches
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exterior: Not Applicable
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item weight: 15.2 ounces
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item model number: 15604B
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best sellers rank: 4,369 in Automotive See Top 100 in Automotive 61 in Tire Repair Tools
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8
TriboTEX8.7Very Good
TriboTEX Nano Oil Additive Car Engine Treatment: Add to Engine Lube - Makes High Mileage Cars Like New with a Synthetic Material (Treats One Regular Truck, Tractor or Small Diesel)
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9
Liqui Moly8.6Very Good
Liqui Moly 2009 Anti-Friction Oil Treatment -pk2
14% Off-
is discontinued by manufacturer: No
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manufacturer part number: 2009-2pk
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item weight: 1.46 pounds
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customer reviews:4.8 4.8 out of 5 stars 332 ratings 4.8 out of 5 stars
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package dimensions: 7.36 x 4.33 x 2.01 inches
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10
Bar's Leaks8.4Good
Bar's Leaks 1000 High Mileage Engine Repair, 16.9 oz, 1-Pack
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