Best Engine Oil Additives In April 2025

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If you are looking for the Best Engine Oil Additives of top quality, read our detailed reviews on them here before making the purchase decision.

To help you in your search, we have completed this list of the Best Engine Oil Additives.

Top Rated Best Engine Oil Additives Of 2025

Rank	Product Name	Score
1	Rislone 4405 Engine Oil Supplement Concentrate with Zinc Treatment - 11 oz Buy Now	9.7 Buy Now
2	Lucas Oil 10278 Engine Oil Stop Leak Buy Now	9.5 Buy Now
3	Liqui Moly 2009 Anti-Friction Oil Treatment - 300 ml Buy Now	9.1 Buy Now
4	Liqui Moly 20004 Hydraulic Lifter Additive Buy Now	8.8 Buy Now
5	ZDDPPlus ZDDP Engine Oil Additive Zinc & Phosphorus 2 Bottles Buy Now	8.6 Buy Now
6	REV X ZDDP Oil Additive - Zinc for Flat Tappet Cams & Engine Buy Now	8.3 Buy Now
7	Slick 50 750002 Recharged High Mileage Engine Treatment, 15-Ounce Buy Now	8.1 Buy Now
8	BestLine Premium Synthetic Engine Treatment with Nano Diamond Technology Extreme Pressure Lubricant Buy Now	7.8 Buy Now
9	Restore Buy Now	7.5 Buy Now
10	Rislone Nano Prime Synthetic Engine & Oil Additive - 16.9 oz Buy Now	7.2 Buy Now

1. Rislone 4405 Engine Oil Supplement Concentrate with Zinc Treatment - 11 oz

• Prevents camshaft wear
• Reduces piston scuffing
• Makes newer oils work in older engines
• Increases engine life

2. Lucas Oil 10278 Engine Oil Stop Leak

• Fit type: universal

3. Liqui Moly 2009 Anti-Friction Oil Treatment - 300 ml

• Forms high load-bearing film of lubricant on all friction surfaces
• Motor oil additive - liqui moly mos2 anti-friction (300 ml. can)
• You will be surprised at how much better your engine sounds and how controlled it will be even at very high rpm

4. Liqui Moly 20004 Hydraulic Lifter Additive

• Cleans valve bores
• Improves the lubrication properties of the oil
• Prevents engine noises caused by hydraulic tappets
• Suitable for use in vehicles with turbochargers and vehicles with catalytic converters

5. ZDDPPlus ZDDP Engine Oil Additive Zinc & Phosphorus 2 Bottles

• Prevent metal on metal contact - zddplus alters characteristics to prevent metal on metal contact
• Protect your engine - older cars with flat tapped lifters-cam need the added zinc for protection
• Compatible with synthetic and conventional motor oils
• For use on pre 1989 and high performance engines
• Easy to use - simply empty entire 4oz contents of the bottle to a 4 to 6 quart oil change.

6. REV X ZDDP Oil Additive - Zinc for Flat Tappet Cams & Engine

• Provides maximum protection for engine break in.
• Treats 6 quarts - the most concentrated form of zinc (zddp) additive available. 3000-3200 parts per million when blended with 6 quarts of oil.
• Protects flat tappet camshafts (hydraulic or solid).
• Provides maximum metal to metal protection.
• Provides increased lubrication of roller lifter bearings (hydraulic or solid).

7. Slick 50 750002 Recharged High Mileage Engine Treatment, 15-Ounce

• Revitalizes seals to help stop oil leaks and prevent them from ever occuring
• Restores performance in engines due to wear and oil consumption in older engines
• Powerful detergents to remove and prevent oil sludge, use during your next oil change or between changes to replace lost additive content
• High mileage solution to protect against power robbing friction heat and wear
• This product is dispensed in 10w-30 which is a multi-grade oil but is fully compatible with all multi grade motor oils and mono grade oils. it is fully compatible with all conventional, semi-synthetic and full synthetic oil types.
• Powerful detergents to remove and prevent oil sludge, use during your next oil change or between changes to replace lost additive content

8. BestLine Premium Synthetic Engine Treatment with Nano Diamond Technology Extreme Pressure Lubricant

• Universal bestline additive: 100% pure synthetic use in gas or diesel car, truck, motorcycle engines
• Try it with confidence: bestline engine oil treatment comes with a 100% money back guarantee
• Bestline engine treatment: increase power/gas mileage.
• Oil additive: use 1 bottle for every 5 quarts of oil for smoother starts & maximum engine protection
• Reduces friction: diamond nano-lubricant noise remover additive creates boundary layer protection on metal

9. Restore

• Reduces oil consumption
• Restores engine performance
• Restores horsepower
• Restores cylinder compression

10. Rislone Nano Prime Synthetic Engine & Oil Additive - 16.9 oz

• This unique rislone additive uses a fully-formulated gf-5/son-rated synthetic motor oil carrier that is backwards-compatible with all vehicles
• Complete with rislone famous detergent and dispersant package
• It is designed to work fully with all oil viscosity grades including ow-20, ow-30, 5w-20, 5w-30, 10w-30, 5w-40, 15w-40 and all others
• This formula is enhanced with synthetic additives including: nan-tungsten and moly friction modifiers, anti-wear agents, and extreme pressure additives
• It contains a base synthetic oil to help improve mileage & performance while decreasing emissions