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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Earl Geikowski Jr loves Lucas Oil Products

I have an atv that i use on our farm. Polaris 500. We use it for alot of work. I allso use it to plow our driveway in the winter time. Well my motor would start getting hot, and i would have to shut it down until it would cool down. But after starting it up , and start plowing it would get hot fast. I have been useing your gas treament in all my ride's, and all my other motor's, and i really like the result's of your product. Well i bought the lucas oil stablelizer, and when i changed the oil i used the oil stableizer, and my atv never got hot again. I am now going to start useing all your product's, i'm very impressed on how well they work. I learned about your product watching racing. I'm a very big fan of the nhra, and nascar allso. that is how i learned of you product. I are saving to buy a tractor for our farm, and it will run on your product. thank's. Earl Geikowski Jr of Vanderbilt Mi.

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