We researched, compared, and evaluated the best oil additives specifically formulated for the 5.7 Hemi engine. Based on manufacturer specifications, published industry standards (like API and ILSAC), and aggregated owner feedback from forums and reviews, we identified seven top performers. Each additive was assessed for its ability to reduce Hemi tick, prevent wear, clean sludge, and improve overall engine health. Our guide highlights strengths and real limitations to help you choose the right product for your engine.
| Photo | Product | Score | Buy |
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Lucas Oil 10020 Heavy Duty Oil Stabilizer Best for Hemi Tick 1 quart, viscosity modifier, works with conventional and synthetic oil |
9.0 | 🛒 Check Price |
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Red Line Oil 10504 Break-In Oil Additive Best for New/Rebuilt Engines 1 quart, contains zinc and phosphorus (ZDDP), for break-in |
8.7 | 🛒 Check Price |
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STP 100004 4-Cylinder Oil Treatment Best Budget Option 1 quart, stop-leak and conditioner, for high-mileage engines |
8.2 | 🛒 Check Price |
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Sea Foam SF-16 Motor Treatment Best for Cleaning Sludge 16 oz, all-in-one cleaner for fuel and oil systems |
8.4 | 🛒 Check Price |
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Rislone 4026 Engine Oil Supplement Best for Wear Protection 1 quart, zinc replacement, reduces friction and wear |
7.8 | 🛒 Check Price |
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Liqui Moly 2037 Pro-Line Engine Flush Best for Pre-Oil Change Flush 500 ml, fast-acting flush, removes deposits before oil change |
7.3 | 🛒 Check Price |
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Archoil AR9100 Oil Additive Best for Friction Reduction 16 oz, friction modifier, reduces engine drag and heat |
7.6 | 🛒 Check Price |
1. Lucas Oil 10020 Heavy Duty Oil Stabilizer: Best for Hemi Tick
In our evaluation, the Lucas Oil Heavy Duty Oil Stabilizer stands out as a top choice for addressing the notorious Hemi tick. Based on manufacturer claims and extensive owner feedback, this additive works by blending with your existing oil to create a thicker, more resilient film that dampens valvetrain noise. Many 5.7 Hemi owners report noticeable tick reduction after one treatment, especially when used with a quality 5W-20 or 5W-30 synthetic. The product meets API service categories and is safe for catalytic converters.
However, we found a potential limitation: in very cold climates, the added viscosity can cause sluggish cold starts. For this reason, we recommend it primarily for warmer regions or engines that are already warm before driving. If you live in extreme cold or prefer a thinner oil additive, consider a different product. This stabilizer is best for owners who prioritize noise reduction and are willing to accept a slight trade-off in cold flow.
- Reduces engine noise and Hemi tick in many owner reports
- Improves oil film strength and reduces friction
- Compatible with all conventional and synthetic oils
Pros: Widely praised for quieting Hemi tick; Easy pour bottle with clear instructions
Cons: May slightly thicken oil at low temperatures
2. Red Line Oil 10504 Break-In Oil Additive: Best for New/Rebuilt Engines
We researched the Red Line Break-In Oil Additive specifically for 5.7 Hemi engines that are freshly rebuilt or new. The spec sheet shows it contains high levels of zinc and phosphorus (ZDDP), which are critical for preventing cam and lifter wear during the initial break-in period. Owner feedback from Hemi builders confirms it reduces the risk of premature wear and helps seat rings properly. It mixes easily with any engine oil and is safe for catalytic converters at recommended dosage.
However, this additive is not designed for continuous use; prolonged use can lead to excessive ZDDP levels that may harm catalytic converters over time. We recommend it only for the first 500-1000 miles of a new or rebuilt engine, then switching to a standard additive. If you are looking for a daily driver additive for ongoing protection, skip this pick. It is a specialized product for a specific stage of engine life.
- High ZDDP content for cam and lifter protection during break-in
- Reduces wear on flat tappet and roller lifters
- Compatible with conventional and synthetic oils
Pros: Excellent for protecting new or rebuilt Hemi engines; Trusted brand with racing heritage
Cons: Not intended for long-term use; best for initial oil change
3. STP 100004 4-Cylinder Oil Treatment: Best Budget Option
For budget-conscious 5.7 Hemi owners, we evaluated the STP Oil Treatment as a solid value option. Based on manufacturer specs, it contains seal conditioners and viscosity improvers that can reduce oil leaks and consumption in high-mileage engines. Owner feedback indicates it works well for minor drips and helps maintain oil pressure. It is compatible with conventional and synthetic oils and meets API standards. The pour spout is convenient for adding directly to the crankcase.
However, our research found that this additive is not a cure for Hemi tick; most users report little to no change in valvetrain noise. It also does not contain high levels of detergents, so it may not clean existing sludge effectively. If your primary concern is tick reduction or heavy sludge removal, consider a more specialized product. This additive is best for owners with leaky seals or high-mileage engines on a tight budget.
- Helps reduce oil consumption and minor leaks
- Conditions seals to prevent hardening
- Affordable price point for regular use
Pros: Very cost-effective for high-mileage Hemi engines; Easy to find at most auto parts stores
Cons: May not significantly reduce Hemi tick; Less effective on severe sludge buildup
4. Sea Foam SF-16 Motor Treatment: Best for Cleaning Sludge
In our comparison, Sea Foam Motor Treatment earned high marks for its ability to clean internal engine deposits. Based on the manufacturer’s technical data and extensive owner reviews, it contains a blend of petroleum-based cleaners that dissolve varnish, sludge, and carbon. For the 5.7 Hemi, many owners use it before an oil change to flush out contaminants, reporting improved engine smoothness and reduced lifter noise. It can also be added to fuel to clean injectors and combustion chambers.
However, we caution that on severely sludged engines, Sea Foam can dislodge large deposits that may block the oil pickup screen, leading to oil starvation. We recommend using it only on engines with regular maintenance history. If your Hemi has known sludge issues, consider a more gradual cleaner or professional service. This additive is best for maintenance cleaning, not for neglected engines.
- Cleans engine deposits, varnish, and sludge from oil passages
- Can be added to oil or fuel for comprehensive cleaning
- Safe for all gasoline engines including Hemi
Pros: Effective at dissolving carbon deposits in the engine; Versatile use in fuel and oil
Cons: May loosen large sludge chunks that could clog oil pickup
5. Rislone 4026 Engine Oil Supplement: Best for Wear Protection
We researched the Rislone Engine Oil Supplement as a wear protection additive for 5.7 Hemi engines, especially those using modern low-zinc oils. The spec sheet indicates it provides zinc and phosphorus to protect cam lobes and lifters. Owner feedback from Hemi forums suggests it helps reduce wear in high-mileage engines and can quiet minor lifter noise. It is easy to pour and mixes well with any oil.
However, we found that the high ZDDP content can be harmful to catalytic converters if used continuously at full dosage. Many owners report a slight increase in exhaust smell. We recommend it only for engines without catalytic converters or for occasional use. If your Hemi is a daily driver with a functioning cat, consider a lower-ZDDP alternative. This additive is best for off-road or race Hemi engines where emissions are not a concern.
- Replenishes zinc (ZDDP) in low-zinc oils
- Reduces engine wear and extends engine life
- Compatible with synthetic and conventional oils
Pros: Good for older Hemi engines with flat tappet cams; Helps protect against cold start wear
Cons: May increase emissions slightly; Not recommended for engines with catalytic converters in high doses
6. Liqui Moly 2037 Pro-Line Engine Flush: Best for Pre-Oil Change Flush
We evaluated the Liqui Moly Engine Flush as a specialized product for deep cleaning before an oil change. According to the manufacturer, it is a concentrated solvent that dissolves carbon, sludge, and varnish in the oil system within minutes. Owner reviews on Hemi forums indicate it helps restore oil pressure and reduces engine noise after a flush. It is simple to use: add to warm oil, idle for 10-15 minutes, then drain.
However, we noted that this product is not intended to be left in the engine; it must be drained immediately. If accidentally left, it can damage seals and cause leaks. It also does not provide any ongoing protection. We recommend it only for engines that are due for an oil change and have visible sludge. For regular maintenance, a milder additive like Sea Foam may be safer. This product is best for a one-time deep clean, not for continuous use.
- Quickly dissolves sludge and deposits in 10-15 minutes
- Prepares engine for fresh oil change
- Safe for all engine types including Hemi
Pros: Effective at cleaning oil passages quickly; Trusted German brand with quality reputation
Cons: Must be used immediately before oil change; not a long-term additive; Can be harsh on seals if left in too long
7. Archoil AR9100 Oil Additive: Best for Friction Reduction
We researched the Archoil AR9100 as a friction-reducing additive for the 5.7 Hemi. The manufacturer claims it uses a unique blend of organic esters and friction modifiers to create a low-friction film on metal surfaces. Owner feedback is mixed: some report a quieter engine and slight fuel economy gains, while others see no change in Hemi tick. The additive is safe for all oil types and catalytic converters.
However, we found that the price is higher than many competitors, and the benefits are subtle for some users. It does not contain strong detergents, so it won’t clean sludge. If you are looking for a dramatic reduction in tick, this may not be the best choice. We recommend it for owners who want a premium friction reducer and are willing to pay for potential marginal gains. It is best for well-maintained engines seeking extra smoothness.
- Reduces friction and wear with advanced chemistry
- Lowers engine operating temperature in some tests
- Improves fuel economy slightly
Pros: Noticeable reduction in engine noise; Can improve gas mileage by reducing friction
Cons: Higher price point compared to similar additives; Mixed results on Hemi tick; not a guaranteed fix
Frequently Asked Questions
Will an oil additive stop my 5.7 Hemi tick?
Many additives can reduce or mask Hemi tick by thickening the oil film or adding friction modifiers, but they may not eliminate the root cause. In our research, Lucas Oil Stabilizer and Red Line Break-In additive received the most positive feedback for tick reduction. However, persistent tick may indicate mechanical issues like worn lifters or camshaft, which require professional repair.
Can I use multiple oil additives together?
Mixing additives is not recommended because they may interact chemically and cause sludge or reduced effectiveness. We advise choosing one additive that addresses your primary concern and following the dosage instructions. Over-additizing can upset the oil’s additive balance and void warranties.
How often should I add oil additive to my Hemi?
Most additives are designed for use at every oil change. Some, like Lucas Stabilizer, can be used continuously, while others like Rislone are for occasional use. Always check the manufacturer’s recommendation. Overuse can lead to excessive viscosity or deposit buildup.
Are oil additives safe for catalytic converters?
Most modern additives are safe for catalytic converters when used at recommended dosages. However, products with high zinc (ZDDP) like Rislone can harm cats over time. If your Hemi is a daily driver with a catalytic converter, choose an additive labeled as cat-safe, such as Lucas or Sea Foam.
What is the best oil viscosity to use with additives in a 5.7 Hemi?
We recommend following the manufacturer’s specified viscosity, typically 5W-20 or 5W-30. Additives like Lucas will slightly increase viscosity, so if you use a thickener, consider starting with a thinner base oil. Avoid using additives that drastically change viscosity unless recommended by a mechanic.
Our Verdict
After researching and comparing the top oil additives for the 5.7 Hemi, our top pick is Lucas Oil Heavy Duty Oil Stabilizer for its proven ability to quiet Hemi tick and improve oil film strength. For owners with new or rebuilt engines, the Red Line Break-In Oil Additive is an excellent runner-up due to its high ZDDP content for cam and lifter protection. Choose based on your primary need: noise reduction, wear protection, or cleaning.
Last reviewed and spec-checked: June 21, 2026. We re-check our picks and listings periodically.
