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
XADO 1 Stage Maximum for Diesel Trucks | Engine Oil additive - Protection for Engines & rebuilding of Worn Metal...
  • Engine Oil Additiv for Diesel Trucks | Restore worn parts’ surfaces and compensate current wear. Increase engine power and acceleration...
  • Suitable for Diesel engines with oil capacity system up to 30-45 qt | Level and increase compression in cylinders. Create active protection...
  • Reduce fuel consumption. Enhance engine service life
  • Increase pressure in oil system up to the nominal level. Reduce noise and vibration
  • GREAT PRODUCT FOR DIESEL ENGINES OF HEAVY-DUTY VEHICLES!!!
No. 2
Competition Cams 159 Engine Break-In Oil Additive, 12 oz. Bottle
  • Improves surface mating of rotating assembly, rod journals, piston rings, valve guides, cam and lifters, etc.
  • Protects all internal engine components, including flat tappet and roller valve trains
  • Proprietary additive package includes optimum amounts of ZDDP (Zinc and Phosphorus), Molybdenum and detergents
  • Requires no additives or supplements for maximum protection
  • Fully compatible with gasoline, methanol and high octane race fuel
No. 3
Red Line 81403 Engine Break-In Oil, 16 Ounce, 1 Pack
  • These Products On Exceptionally High Order Fulfillment Rates, Breadth Of Available Products
  • These Are Complete Line Of Heavy-Duty Shop Products
  • Through Creativity, Productivity And Innovation - This Brand Continues To Develop The Finest Automotive Accessories
No. 4
BestLine Premium Synthetic Engine Treatment 1-Pack
  • LONG LASTING ENGINE: BestLine uses its revolutionary formula to provide your vehicle with maximum engine life protection, proven to increase...
  • VISIBLE BENEFITS: This engine treatment reduces the likelihood of low-speed, pre-ignition, reduces friction for improved fuel mileage, and...
  • 100% PURE SYNTHETIC: BestLine’s superior lubricant has been formulated with a 20 weight full-synthetic base oil, designed specifically for...
  • UNIVERSALLY COMPATIBLE: This product can be used on a variety of new or old automobiles. BestLine is compatible with all types of motor oil...
  • TRUST BESTLINE: Our product is unique in that it is the only engine treatment with 52 worldwide patents. If you are not satisfied with...
No. 5
BestLine Premium Synthetic Engine Treatment
  • LONG LASTING ENGINE: BestLine HP uses its revolutionary formula to provide your vehicle with maximum engine life protection, proven to...
  • VISIBLE BENEFITS: This engine treatment reduces smoke and engine noise, and improves overall power and mileage. It also reduces friction and...
  • 100% PURE SYNTHETIC: BestLine’s superior lubricant has been formulated with a 20 weight full-synthetic base oil, designed specifically for...
  • UNIVERSALLY COMPATIBLE: This product can be used on a variety of new or old automobiles. BestLine is compatible with all types of motor oil...
  • TRUST BESTLINE: Our product is unique in that it is the only engine treatment with 52 worldwide patents. If you are not satisfied with...
No. 6
Liqui Moly 2037 Pro-Line Engine Flush - 500 Milliliters
  • Easy way to clean and flush the oil systems of gasoline and diesel engines
  • Gentle and rapid cleaning
  • Neutral to seals and other materials installed in the engine
  • Compatible with catalytic converters
  • Simple to use
No. 7
ZDDPPlus ZDDP Engine Oil Additive Zinc & Phosphorus 10 Bottle Pkg
  • Prevents premature cam and valve train failure
  • Extreme pressure protection
  • For use on pre-1989 engines
  • Use in high-performance and classic cars
No. 8
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.