Extreme Duty Marine Semi Synthetic 20W-50 Engine Oil

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Extreme Duty Marine Semi Synthetic 20W-50 Engine Oil

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

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* Size:


  • #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

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Joseph Sokol uses Lucas Power Steering Stop Leak for 1987 Chevy Celebrity

To Whom It May Concern:

On Thursday, Jan. 8, 2004 I took my 1987 Chevy Celebrity in to a local Firestone dealer for service. He noticed the steering was binding up and getting hard to steer. (I have been noticing that for sometime, but it was getting worse.) He said it will not pass Pennsylvania state inspection, which is due in May. He suggested a new rack, price $482.00 parts and labor.

I didn't want to invest into such an old car. I saw your product "Lucas Powersteering Stop Leak" at an auto parts store. I drained the power steering fluid and added one bottle, price "$6.97". Now the car steers like a new one.

Just thought you might like to know, I'm a "VERY SATISFIED CUSTOMER". In the future I look forward to trying other Lucas products.

Thank you very much.


Joseph M. Sokol

Mechanicsburg, PA

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