Extreme Duty Marine Semi Synthetic 20W-50 Engine Oil

Lucas Oil Products, Inc.



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Extreme Duty Marine Engine Oil Semi Synthetic SAE 20W-50


Lucas Extreme Duty Marine Semi Synthetic 20W-50 Engine Oil is designed for use in high performance boats requiring the ultimate protection.

Lucas Extreme Duty Marine Semi Synthetic 20W-50 Engine Oil is manufactured with the highest quality paraffinic base oils and is fortified with an exclusive additive package containing high levels of Zinc, Moly and Phosphorus that provides a tougher, thicker additive film for maximum protection even under the most sever conditions. It lowers oil temperatures, extends oil life and minimizes metal fatigue.

Lucas Marine Semi Synthetic 20W-50 improves the film strength between the cylinder  wall and piston rings and slows oil burning while improving pressure levels in worn engines. It has good cold temperature properties and stands up to high operating temperatures. This product is compatible with methanol and all racing fuels.

Key Benefits

  • Excellent for use with supercharged, turbo charged or nitrous oxide high performance engines
  • Protects against rust and moisture during long periods of storage
  • Safely blends and is compatible with synthetic and non-synthetic oils
  • Dropping point 540 lbs
  • Provides rust and corrosion protection in both fresh water and salt water environments
  • Effective Water Resistance
  • Long Lasting
  • Resist Extreme Pressure
  • Extreme Friction Reducer


  • #10654 - 1 Quart (Case of 6) - 12 lbs
  • #10811 - 5 Quart (Case of 3) - 31 lbs
  • #10667 - 5 Gallon Pail (1 Pail) - 40 lbs
  • #10668 - 55 Gallon Drum (1 Drum) - 440 lbs


Product Spec Sheet Technical Data Sheet
Safety Data Sheet Safety Data Sheet
zinc Zinc Values

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I swear to you, it is the best thing I every did for my truck.

I have a 1997 Dodge Dakota with 335,000+ miles. A few thousand miles ago my trany started slipping really badly. It was even hard for me to pull out on the interstate. I would have to pull over to the side , put the truck in reverse, then forward, and hopefully it would go forward. I kept seeing your commercial, and even though I was doubtful , I bought a bottle of your transmission treatment. I swear to you, it is the best thing I every did for my truck. It has not slipped even once. I even bought another bottle of treatment to have on hand, but I have not needed it. Thank you Lucas Oil. A now loyal customer. - Beverly Smith, Homer Ga.

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