Best Oil Additive for Diesel (2026): 5 Picks for Diesel Trucks

Best oil additive for diesel compared

Specifications are manufacturer rated, as published on each listing and collected 1 November 2026.

How the points were given

Each pick is scored on performance, build, value, safety and warranty. How we pick explains the weights. A safety score above zero needs a stated safety feature or listing, and a warranty score above zero needs a stated warranty term, so picks with no stated listing or term score zero in those columns.

Scores run from 9.2 to 9.8: each product’s point total is placed on that range, so more points always means a higher score.

What the listings tell you

Five diesel oil additive listings were read for this guide. Each listing states a diesel use, a bottle size or a treat rate, but the listings differ sharply in how much detail they give. Cells stay not stated where a listing gives no figure.

Buying guide: a diesel oil additive

Stiction and cold starts

Stiction help matters most where a listing names it. The Hot Shot’s Secret Original listing calls itself a stiction eliminator for HEUI injectors. The Archoil AR9100 listing names injector stiction in 6.0L and 7.3L Power Stroke engines, with cold start misfires and rough idle among the symptoms it lists. The other listings do not name stiction, so they should not be picked for that job alone.

Wear claims

Wear claims vary in form. The Hot Shot’s Secret Original listing claims wear reduced by up to 62% more than engine oil alone. The Prolube listing claims wear reduced by up to 45%. The Archoil listing describes a solid lubricating barrier that reduces wear, without a figure. The TriboTEX listing describes a diamond-like carbon coating that reverses wear in bearings, without a figure.

Treat rate and bottle size

Treat rate decides how far a bottle goes at oil change time. The Hot Shot’s Secret Original listing gives 4 oz per quart for initial cleanup and 2 oz per quart for maintenance, in a 64 oz bottle that treats 32 quarts. The Archoil listing gives 1.2 oz per quart for engines in a 16 oz bottle. The Prolube listing gives 1 oz per quart for standard engines and 2 oz per quart for heavy-duty or high-mileage engines in a 16 fl oz bottle. The Diesel Duo kit and the TriboTEX listing state no treat rate per quart.

Oil and fuel systems

Most picks here cover the oil system only. The Hot Shot’s Secret Diesel Duo kit is different because it pairs Stiction Eliminator for engine oil with Diesel Extreme for the fuel system. The Diesel Extreme part of that kit cleans injector tips, disperses moisture, restores throttle and boosts cetane up 7 points. A buyer who wants fuel system help as well as oil help should look at the kit, not at an oil-only pick.

Warranty and listing notes

Warranty terms are thin across this set. The TriboTEX listing states a 6 months satisfaction guarantee. The Hot Shot’s Secret listings state a satisfaction or money-back promise without a term. The Archoil and Prolube listings state no warranty term. No listing here states an electrical or safety listing, so safety scores stay at zero across the set.

Garage Fit Check

• Check the treat rate on the listing before pouring, since rates run from 1 oz per quart to 4 oz per quart across this set.
• Check bottle size against the sump: bottles here run from 16 oz to 128 Fluid Ounce for the kit.
• Check whether the pick covers oil only or oil plus fuel, since only the Diesel Duo kit covers the fuel system.
• Store bottles upright in a cool, dry spot away from the workbench edge, and keep the cap closed between oil changes.

FAQ: garage tools

How do you use an engine oil additive?

Follow the treat rate on the listing for the pick in hand. Rates in this guide include 1 oz per quart, 1.2 oz per quart, 2 oz per quart and 4 oz per quart, depending on the pick and on whether the listing calls for initial cleanup or maintenance. The Hot Shot’s Secret Original listing says to use it with every oil change.

How does an engine oil additive work?

According to the listings, an additive blends with engine oil to reduce friction between engine components. The Prolube listing says its formula decreases friction, optimizes performance and prevents overheating. The Archoil listing says its formula creates a solid lubricating barrier to reduce wear and support longer component life.

What is the best oil additive for engine noise?

For noise, look at listings that name noise directly. The Prolube listing says it reduces engine noise and smooths vibrations. The Archoil listing says it quiets operation by improving lubrication under high-load conditions. The TriboTEX listing says it reduces engine noise as part of quieter and smoother performance.

Can one additive cover gas and diesel engines?

Several listings here state both uses. The Prolube listing states compatibility with gasoline and diesel engines, as well as transmissions. The Archoil listing states suitability for all diesel and gasoline engines. The Hot Shot’s Secret Original listing states it is good for gasoline and diesel engines.

Does an engine oil stabilizer work?

No listing here uses the word stabilizer for its product, so this guide makes no claim for a stabilizer as such. What the listings do claim is narrower: reduced friction, reduced wear, smoother operation and, for some picks, stiction help or a cetane boost. Match the claim on the listing to the job, rather than assuming a general stabilizing effect.

Related: the engine and shop equipment hub, the best engine oil additive guide, and the best diesel fuel additive guide.