Best Oil Additive For 5 7 Hemi: Compare 10 Engine Treatments

#1 · Best Overall

1. Liqui Moly Cera Tec

Best for: Ceramic wear protection seekers.

Why it ranks #1: Its ceramic wear protection is mixable with commercially available motor oils and is described for petrol and diesel engines, making it a versatile option.

Ceramic compounds that resist high chemical and thermal loads define Liqui Moly Cera Tec, offering buyers a friction-and-wear-focused additive for motor oil. The listing says it mixes with commercially available motor oils and remains compatible with commonly used filter systems, supporting integration into an existing oil setup.

Cera Tec's low-friction ceramic compounds are described as reducing wear and preventing direct metal-to-metal contact, tying the material claim to engine-protection goals. Its stated stability under high thermal and dynamic permanent loads may suit operation where oil experiences demanding conditions. Compatibility with commercially available motor oils and common filter systems makes it easier to consider alongside existing maintenance components. The listing also notes resistance to extremely high and low temperatures, though it provides no specific oil-capacity dose in the supplied facts.

Skip it if you need a product specifically aimed at hydraulic-tappet noise; Liqui Moly Hydraulic Lifter Additive names that use.

Cera Tec suits buyers prioritizing ceramic-based wear protection in a motor-oil additive while retaining compatibility with common oils and filter systems. Consider the lack of a supplied treatment rate when planning the amount for a particular oil change.

Listed on Amazon as: 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

#2 · Friction Reducer

2. Hot Shot's Secret FR3

• Compatible with Vehicle Type: Car
• Size: 8 Fl. Oz.
• Container Type: Bottle

Best for: Synthetic friction-reduction seekers.

Why it ranks #2: The 8-ounce synthetic additive is listed for gas and diesel engines and targets friction and wear, with a claimed fuel-economy improvement of up to 5 percent.

A 100% synthetic formulation distinguishes Hot Shot's Secret FR3, which is presented as a friction reducer for both gas and diesel engines. The listing connects reduced friction with engine protection, smoother operation, and claimed horsepower and fuel-economy improvement of up to five percent.

FR3's friction-reduction purpose gives buyers a clear reason to consider it as an oil additive, while the product states that it is suitable for gas and diesel engines. The listing connects less friction with reduced wear and smoother operation, making the claimed benefit relevant to engine operation rather than a cleaning or break-in task. It also claims fuel economy and horsepower gains of up to five percent. The supplied details identify an 8-ounce bottle but do not state an oil-capacity treatment rate.

Skip it if you need a stated oil-change dose for four or five quarts; STP High Viscosity Oil Treatment provides that direction.

FR3 suits an owner looking for a synthetic friction reducer for a gas or diesel engine, with stated goals of smoother operation and improved economy. The supplied facts do not give a treatment rate, which limits dose planning.

Listed on Amazon as: Hot Shot's Secret FR3 Friction Reducer Oil Additive, 8 oz

#3

3. Prolube Oil Treatment

• Compatible with Vehicle Type: Car
• Size: 6 fl oz
• Container Type: Bottle

Best for: Multi-system treatment buyers.

Why it ranks #3: This 6-ounce treatment is listed for gas and diesel engines and also works with transmissions and differentials, though the data gives no dose guidance.

Its stated use across engines, transmissions, and differentials gives Prolube a broader role than an engine-only additive. The 6-ounce bottle is positioned for gas and diesel engines, with the product title also claiming reduced wear, noise, and vibration, plus improved fuel economy and horsepower.

For an owner considering an additive beyond engine oil, the listed transmission and differential applications make this bottle relevant to several vehicle systems. Its gas-and-diesel engine positioning gives it broad engine-use scope, while the stated reduction in wear, noise, and vibration speaks to operating concerns rather than a specialized cleaning task. The 6-ounce size is a compact bottle, but the supplied information does not specify a treatment rate or oil-capacity coverage, so dosing details are not established here.

Skip it if you need a stated dose for a known oil capacity; STP High Viscosity Oil Treatment specifies use with four or five quarts.

This suits a buyer seeking one additive presented for engine, transmission, and differential use, including gas or diesel engines. The available details do not establish dosing, so it is a less-defined choice when precise oil-capacity instructions matter.

Listed on Amazon as: Prolube Oil Treatment – Engine Oil Additive for Gas & Diesel Engines – Reduces Wear, Noise, Vibration – Boosts Fuel Economy & Horsepower – Works on Transmissions & Differentials (6oz)

#4 · Lifter Noise Focus

4. Liqui Moly Hydraulic Lifter Additive

Best for: Hydraulic lifter noise focus.

Why it ranks #4: Its stated purpose is to prevent hydraulic-tappet engine noises, and it is listed for gasoline and diesel engines with or without turbocharging.

Hydraulic-lifter noise is the specific problem Liqui Moly Hydraulic Lifter Additive addresses, making it a targeted option rather than a broad-purpose wear treatment. It cleans valve bores and improves oil lubrication properties, and the supplied description says it suits turbocharged engines and catalytic converters.

The valve-bore cleaning claim pairs with the product's stated aim of damping noise from worn hydraulic lifters, connecting maintenance to smoother lifter operation. Adding it to engine oil also improves lubrication properties, according to the listing. Compatibility is specified for gasoline and diesel engines, with and without turbocharging, and the product is tested for catalytic-converter compatibility. That range helps owners assess it for varied engine configurations, though the supplied details do not state an oil-capacity dose.

Skip it if you seek ceramic wear protection for motor oil rather than lifter-focused cleaning; Liqui Moly Cera Tec is the ceramic option.

This fits an owner investigating hydraulic-tappet noise who wants a product specifically described for valve-bore cleaning and oil lubrication. Its stated compatibility includes turbochargers and catalytic converters, but it is not presented as a general ceramic wear treatment.

Listed on Amazon as: Liqui Moly Hydraulic Lifter Additive | 300 ml | Oil additive | SKU: 8367

#5 · Largest Bottle

5. Dura Lube Engine Treatment

• Compatible with Vehicle Type: Gas and diesel engines
• Size: 32 Fl. oz.
• Container Type: Bottle

Best for: Cold-start lubrication support.

Why it ranks #5: The 32-ounce treatment is listed for gas and diesel engines, with claims addressing friction, cold-start lubrication, noise, and operating temperature.

Additional lubrication during cold starts is a key claim for Dura Lube Engine Treatment, aimed at reducing wear when the engine is described as most vulnerable. Its 32-ounce bottle is directed to an oil-change workflow: remove 32 ounces of oil, then add the bottle.

The stated protective barrier on internal engine components pairs with friction and wear reduction, offering a clear maintenance rationale for this treatment. Dura Lube also claims quieter, smoother operation and lower operating temperatures, while its cold-start lubrication claim focuses on a specific engine condition. The listing says it works with all types of combustion engines and gives a direct replacement-volume instruction: remove 32 ounces of oil before adding the 32-ounce bottle. That makes the servicing step explicit, but requires room for that volume.

Skip it if you cannot remove and replace 32 ounces of oil during service; Liqui Moly Cera Tec is listed as mixable with motor oils.

This suits owners seeking cold-start lubrication and a broad combustion-engine treatment who can follow the specified oil-change procedure. The 32-ounce removal instruction is an important workflow consideration before choosing it for a particular service.

Listed on Amazon as: Dura Lube Engine Treatment | 32 oz., Single

#6

6. STP High Viscosity Oil Treatment

• Compatible with Vehicle Type: Car, Truck, SUV
• Size: 15 Fl Oz (Pack of 1)
• Container Type: Can

Best for: Routine oil-change maintenance.

Why it ranks #6: Its ZDDP anti-wear agent is designed to reduce metal-to-metal friction; directions specify one bottle for four or five quarts of oil.

ZDDP anti-wear agent is the defining feature of STP High Viscosity Oil Treatment, giving routine oil-change buyers a friction-focused additive. Its thicker cushion is intended to lubricate moving engine parts and reduce oil consumption, and the formula is specified for conventional or synthetic oil.

The high-viscosity formula and ZDDP work toward practical protection by cushioning moving parts and fighting metal-to-metal friction. STP says the treatment can help reduce oil consumption, a relevant consideration for owners maintaining an engine between service intervals. Its compatibility with conventional and synthetic oils, plus cars, light trucks, and SUVs, supports broad everyday use. The directions call for one bottle with four or five quarts at each oil change, making the maintenance workflow clear for that volume.

Skip it if you need an additive specifically presented for transmissions and differentials; Prolube Oil Treatment lists those applications.

This is a practical match for car, light-truck, or SUV owners adding treatment during regular oil changes, with conventional or synthetic oil. Its stated dose is for four or five quarts, so check whether that volume suits your maintenance routine.

Listed on Amazon as: STP High Viscosity Oil Treatment, Car Oil Additive, 15 Fl Oz

#7

7. Lucas Heavy Duty Oil Stabilizer

• Compatible with Vehicle Type: Car
• Size: 1 Quart
• Container Type: Bottle

Best for: Multi-use petroleum stabilizer.

Why it ranks #7: The petroleum supplement is described for engine friction, heat, and wear, but its heavy-duty focus also includes manual transmissions and differentials.

Lucas Oil Heavy Duty Oil Stabilizer is a 100% petroleum supplement with stated uses in engines, manual transmissions, and differentials. The product claims to minimize friction, heat, and wear, while controlling noise in transmissions and differentials, giving it a broader maintenance role than engine-only additives.

Its petroleum formulation is described as suitable for new engines, with claims that it minimizes friction, heat, and wear and helps eliminate dry starts. For drivetrain maintenance, the listing specifically names manual transmissions and differentials, where it says the stabilizer controls noise, heat, and wear. This multi-use scope can suit an owner maintaining more than the engine, while the one-quart bottle provides a larger amount than the small-dose syringe treatments. The supplied details do not provide an engine oil-capacity treatment ratio.

Skip it if you need an explicit engine treatment rate by quart; Archoil AR9100 lists a rate per quart.

This suits owners seeking a petroleum supplement with stated engine, manual-transmission, and differential applications. Its broad use claims are useful for multi-system maintenance, but the supplied facts do not establish an engine-specific treatment ratio.

Listed on Amazon as: Lucas Oil 10001 Heavy Duty Oil Stabilizer – 1 Quart

#8

8. Archoil AR9100

• Container Type: Jug

Best for: Gas and diesel anti-wear use.

Why it ranks #8: It is suitable for gasoline and diesel engines, but its prominent injector-stiction treatment is specifically directed at 6.0L and 7.3L Power Stroke engines.

HEUI injector stiction is Archoil AR9100's most specific use, with the listing tying it to cold-start misfires, rough idle, and sluggish response in 6.0L and 7.3L Power Stroke engines. It is also specified for gasoline and diesel engines beyond Power Stroke applications.

The targeted HEUI claim gives owners of 6.0L or 7.3L Power Stroke engines a direct reason to consider AR9100 when injector stiction is associated with cold-start or idle problems. For broader use, the listing also names gas and diesel engines and gives a treatment rate of 1.2 ounces per quart for engines, limited-slip differentials, and motorcycles. One 16-ounce bottle is stated to treat a 6.0L or 7.3L Power Stroke with 13 to 16 quarts, clarifying that application.

Skip it if you want a product specifically framed around cold-start lubrication across combustion engines; Dura Lube Engine Treatment makes that claim.

AR9100 suits owners seeking a stated treatment rate for engines, limited-slip differentials, or motorcycles, especially Power Stroke HEUI owners addressing stiction symptoms. Its most specific injector claim applies to the listed 6.0L and 7.3L systems.

Listed on Amazon as: Archoil AR9100 Oil Additive (16oz) for All Vehicles – Powerstroke Cold Starts, Eliminates Injector Problems

#9

9. XADO EX120 Motor Oil Additive

• Compatible with Vehicle Type: Car
• Size: 8 milliliters
• Container Type: Syringe

Best for: High-mileage engine treatment.

Why it ranks #9: The 8-milliliter syringe is listed for gas and LPG vehicles and high-mileage engines, with application instructions for oil capacities up to 10 quarts.

XADO EX120 uses a claimed metal-ceramic coating to address worn engine parts, making it a specialized treatment for high-mileage engines. Its 8-milliliter syringe is specified for cars with oil capacity up to 10 quarts, and the listing gives a warm-engine application sequence.

The stated rebuilding of worn metal surfaces pairs with protective coating claims, giving the product a restorative focus beyond routine lubrication. XADO says the treatment can provide protection for up to 62,000 miles and reduce fuel consumption at idle and during normal driving. For application, the instructions call for warming the engine to normal operating temperature, switching it off, and emptying the syringe into the engine oil. Its stated coverage is for cars with oil capacity up to 10 quarts, helping define the intended scope.

Skip it if you have an oil capacity above 10 quarts; Archoil AR9100 lists treatment rates by quart for engines.

This is aimed at high-mileage car owners seeking a metal-surface treatment and able to follow its warm-engine application steps. Its stated scope is oil capacity up to 10 quarts, a boundary to consider before use.

Listed on Amazon as: XADO EX120 Motor Oil Additive – Engine Restore – Ceramic-Metal Coating and Revitalizant – Oil Treatment for High Mileage Engines – Restores Worn Metal Parts – for Gas and LPG Vehicles (Syringe 8 ml)

#10

10. Lucas Engine Break-In Additive

• Compatible with Vehicle Type: Car
• Size: 16 Oz.
• Container Type: Bottle

Best for: Flat-tappet break-in builders.

Why it ranks #10: Its listed use centers on new motors, flat-tappet camshafts, and break-in, a narrower application than routine treatment for an in-service Hemi.

Its extreme-pressure additive blend is aimed at new motors and flat-tappet camshafts, giving Lucas Oil Engine Break-In Additive a focused role during break-in. The product also says it increases oil zinc content and helps protect camshaft lifters and the valve train during that period.

For a new engine or flat-tappet build, the stated protection for camshaft lifters and the valve train directly addresses parts highlighted for break-in. Lucas Oil says the additive helps seat new rings and reduce blow-by, linking the formulation to the early operating period rather than routine general maintenance alone. It is also described for race applications requiring additional extreme-pressure additives and as an addition to motor oil to help prevent premature wear. The supplied details do not state a treatment ratio.

Skip it if you want a routine friction additive rather than break-in protection; STP High Viscosity Oil Treatment gives an oil-change dose for regular maintenance.

This is a focused choice for builders breaking in a new motor, especially one with a flat-tappet camshaft or race application needing extra extreme-pressure additives. Its break-in emphasis makes it less directly specified for ordinary ongoing oil-change maintenance.

Listed on Amazon as: Lucas Oil 10063 Engine Break in Oil Additive w/TB Zinc Plus – 16 Ounce