Best oil additive for old engines – Top 8 of 2020

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We examined tons reviews, and put together a list of the top sellers. Check out the top oil additive for old engines below.


No. 1
ZDDPPlus ZDDP Engine Oil Additive Zinc & Phosphorus 2 Bottles
52 Reviews
ZDDPPlus ZDDP Engine Oil Additive Zinc & Phosphorus 2 Bottles
  • PROTECT YOUR ENGINE - Older cars with flat tapped lifters-cam need the added zinc for protection
  • EASY TO USE - Simply empty entire 4oz contents of the bottle to a 4 to 6 quart oil change.
  • PREVENT METAL ON METAL CONTACT - ZDDPlus alters characteristics to prevent metal on metal contact
  • FOR USE ON PRE 1989 AND HIGH PERFORMANCE ENGINES
  • COMPATIBLE WITH SYNTHETIC AND CONVENTIONAL MOTOR OILS
No. 2
Lucas Oil 10278 Engine Oil Stop Leak
412 Reviews
Lucas Oil 10278 Engine Oil Stop Leak
  • Fit Type: Universal
  • Renews worn seals with no risk of damage or eventual corrosion
  • Reduces engine noise and oil consumption, while raising oil pressure
  • Contains no harmful solvents
No. 3
XADO Engine Oil additive - Protection for Engines - additive for wear Protection & rebuilding of Worn Metal Surfaces -...
169 Reviews
XADO Engine Oil additive - Protection for Engines - additive for wear Protection & rebuilding of Worn Metal Surfaces -...
  • Engine oil additive restores the surfaces of the engine parts and compensates for the resulting wear
  • Restoration of engine compression | Repair of the surfaces
  • Provides active protection against overload and overheating | Extends lifespan
  • Lowers fuel consumption effectively | protects the engine against wear | Atomic metal conditioner
  • Motor oil additive with Revitalizant | Engine oil additive | Suitable for gasoline and gasoline engines
No. 4
Red Line (15305) 5W30 Motor Oil - Full-synthetic Ester Formula Car Engine Oil - 1 Gallon
  • For best performance, follow the manufacturer's recommendations in your vehicle owner’s manual.
No. 5
TriboTEX Small Oil Additive Engine Treatment: Add to Engine Oil - Makes High Mileage Engines Like New with a Synthetic...
  • Contains synthetic nanoparticles developed with the U.S. Department of Energy, NASA, & National Science Foundation
  • Reverses wear in bearings by building a diamond-like carbon coating
  • Compatible with all types of motor oil and can be used in gas or diesel engines
  • Improves fuel consumption and reduces engine noise
  • Safe for wet clutches in motorcycles
No. 6
Archoil AR9100 Oil Additive (16oz) for All Vehicles - Powerstroke Cold Starts, Eliminates Injector Problems
671 Reviews
Archoil AR9100 Oil Additive (16oz) for All Vehicles - Powerstroke Cold Starts, Eliminates Injector Problems
  • 16oz AR9100 Friction Modifier- Treats one PowerStroke
  • Fixes 6.0 and 7.3L PowerStroke Cold Start Injector Problems.
  • For gasoline and diesel engines, gearboxes, hydraulics, differentials and power steering systems.
  • Reduces wear and extends component life
  • Reduces engine noise, vibration, and friction heat.
No. 7
Lucas 32 Ounce 10001 Heavy Duty Oil Stabilizer-32 Oz
  • For best performance, follow the manufacturer's recommendations in your vehicle owner’s manual.
  • Increase oil life at least 50 percent longer
  • Reduces oil consumption
  • Eliminates dry starts
  • Raises oil pressure
No. 8
Bg Products MOA & EPR Motor Oil Additive Lubrication Supplement Engine Restore
36 Reviews
Bg Products MOA & EPR Motor Oil Additive Lubrication Supplement Engine Restore
  • BG MOA 100 fortifies all qualities of engine oil, providing superior, long-lasting engine protection and maintain peak engine performance....
  • BG EPR Engine Performance Restoration effectively softens, emulsifies and dissolves even the most stubborn fuel gums that clog rings. works...
  • BG MOA motor oil treatment (11oz) and BG EPR engine performance restoration (11oz).