10 Best Engine Oil Treatments 2020

Gareth Otwell Reviewed by Gareth Otwell | Last Updated:

After analyzing products, scanning reviews, spending more than 36 hours of research and speaking with our test users, we think the STP High Mileage Oil Treatment is the one of the Best Engine Oil Treatment on the market.

STP High Mileage Oil Treatment – Best Overall Engine Oil Treatment

STP High Mileage Oil Treatment
  • Rejuvenates seals and gaskets
  • Helps stop leaks, noise and smoking
  • Contains zinc anti-wear agent ZDDP
  • Excellent for all cars, light trucks and SUV's
  • Use every oil change

Lucas 32 Ounce 10001 Heavy Duty Oil Stabilizer-32 Oz

Lucas 32 Ounce 10001 Heavy Duty Oil Stabilizer-32 Oz
  • The product is 32oz hd oil stabilizer
  • Easy to use, increases power and miles per gallon
  • Made in USA, increase oil life at least 50 percent longer

Prolong Super Lubricants PSL11000 Engine Treatment

Prolong Super Lubricants PSL11000 Engine Treatment
  • Includes a Formula with Anti-Friction Metal Treatment Technology
  • Features Engineering Designed to Treat Metal Surfaces of Both Gasoline and Diesel Fueled Engines
  • Offers Molecules that Interact with Metal Surfaces and Chemically Bond to Create a Protective Layer that Reduces Damaging Friction and Heat
  • Offers to Protect the Engine Even when the Motor Oil is Not Yet Fully Circulating
  • Features a Formula Containing No Solid Particles Such as PTFE Resins, 'Molys', Zinc, Copper, or Graphite

Rislone 100QR Engine Treatment Conditioner and Cleaner – Best Budget Engine Oil Treatment

Rislone 100QR Engine Treatment Conditioner and Cleaner
  • Frees valves and lifters
  • Reduces friction and wear
  • Maintains oil viscosity
  • Cleans and conditions engines
  • Dissolves and removes harmful deposits

BestLine Premium Synthetic Engine Treatment with Nano Diamond Technology Extreme

BestLine Premium Synthetic Engine Treatment with Nano Diamond Technology Extreme
  • BESTLINE ENGINE TREATMENT: Increase power/gas mileage.
  • REDUCES FRICTION: Diamond Nano-lubricant noise remover additive creates boundary layer protection on metal
  • UNIVERSAL BESTLINE ADDITIVE: 100% Pure Synthetic use in gas or diesel car, truck, motorcycle engines
  • OIL ADDITIVE: Use 1 bottle for every 5 quarts of oil for smoother starts & maximum engine protection
  • TRY IT WITH CONFIDENCE: BestLine Engine Oil Treatment comes with a 100% money back guarantee

Lucas AI Innovations LUC Heavy Duty Oil Stabilizer 1 Gallon – Premium Pick

Lucas AI Innovations LUC Heavy Duty Oil Stabilizer 1 Gallon
  • Formulated To Eliminate Dry Starts And Reduce Friction, Heat And Wear In Any Type Of Engine
  • It Allows Motor Oils A Higher Degree Of Lubricity Which Reduces Oil Consumption And Operating Temperatures
  • Through Creativity, Productivity And Innovation - This Brand Continues To Develop The Finest Automotive Accessories

Bar's Leaks Engine Treatment Specially Formulated for High-Mileage Engines

Bar's Leaks Engine Treatment Specially Formulated for High-Mileage Engines
  • Reduces friction and wear
  • Quiets noisy lifters and valves
  • Removes and prevents sludge
  • Add to engine oil anytime
  • Will not void manufacturer's new vehicle

Liqui Moly 2009 Anti-Friction Oil Treatment

Liqui Moly 2009 Anti-Friction Oil Treatment
  • Motor oil additive - Liqui Moly MoS2 anti-friction (300 ml. Can)
  • Forms High load-bearing film of lubricant on all friction surfaces
  • You will be surprised at how much better your engine sounds and how controlled it will be even at very high RPM

Sea Foam SF-16 Motor Treatment

Sea Foam SF-16 Motor Treatment
  • Cleans injectors, carb jets and passageways
  • Cleans and lubricates intake valves, pistons and cylinders
  • Dissolves and cleans fuel residue in fuel systems
  • Dissolves oil deposits in crankcase
  • Clean timing chain tensioners and VVT actuators, quiet noisy lifters
  • 100 percent pure petroleum
  • EPA registered product
  • Liquefies gum and varnish deposits or internal engine contaminants
  • Special Shipping Information: This item cannot be returned and has additional shipping restrictions
  • Special Shipping Information: This item cannot be returned and has additional shipping restrictions

Slick 50 750002 Recharged High Mileage Engine Treatment

Slick 50 750002 Recharged High Mileage Engine Treatment
  • High Mileage solution to protect against power robbing friction heat and wear
  • Restores performance in engines due to wear and oil consumption in older engines
  • Revitalizes seals to help stop oil leaks and prevent them from ever occuring
  • Powerful detergents to remove and prevent oil sludge, use during your next oil change or between changes to replace lost additive content
  • Powerful detergents to remove and prevent oil sludge, use during your next oil change or between changes to replace lost additive content
  • 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.

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