Extreme Duty Marine Semi Synthetic 20W-50 Engine Oil

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

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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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Randy's 1984 Pontiac has over 500,000 miles with Lucas Oil Products

Wednesday, November 16, 2011

Dear Sirs,

I am writing to you to thank you for your products and the impact it has had on my vehicle. In 1985 I purchased from an employer a 1984 Pontiac Parisienne that needed to have the engine replaced. I have faithfully used Lucas products in this vehicle since that time and have over 500,000 miles on the engine at this time. I get excellent gas mileage and the vehicle never burns or uses oil. While the car may look its age on the outside on the inside it has never wavered. Every time I start it up and drive it is true and dependable. I know some companies who produce products like yours occasionally likes to purchase historical testimonials of their products and they like to study the long term use of their products in actual real life situations. I have reached a milestone with this vehicle and recognize it may have some value to you as a research vehicle or a testimonial.

Ray Meyers

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