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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Kortez Brown uses Upper Cylinder Lubricant and Injector Cleaner in 2004 Chevy Trailblazer.

I just wanted to let you know how much of a difference your Upper Cylinder Lubricant and Injector Cleaner has made in my 2004 Chevy Trailblazer. I was down to about a 1/4 tank of gas when my SUV started to run rough. Almost like one of the cylinders was not firing correctly. I ran the tank down to almost empty and ran to the Checker's Auto Store to grab a bottle of fuel injector cleaner. I've used fuel injector cleaners before, but I decided to ask one of the sales reps which one he recommended. He pointed out the Lucas Injector Cleaner. I drove to the gas station down the street, poured the cleaner into the gas tank, and filled my tank full of 91 octane gas. I noticed an instant difference in acceleration and response time when passing cars on the highway when I decided to pass someone. I am extremely pleased with this product and I will recommend it to my friends and family. I will also explore the uses of other your products in my Trailblazer.

thanks, Kortez Brown

Chandler, Arizona

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