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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Dan A. Beck uses Lucas Transmission Fix in 1996 Dodge Ram

I have a 1996 dodge ram. I had the tranny completely rebuilt with 103,000 miles on it. All new solinods and converter. Wtih 30,000 on the rebuild it started acting up. Almost like it was towing a heavy trailor from a dead stop it was fighting itself. I described the symptoms to the guy the rebuilt the tranny. He said it sounded like and electrical solinoid or something worse. Told me it would be at least 500.00 to fix it. To me it sounded like a stuck valve in the valve body or something. I tryed your transmission fix. I was doughting if it would work. I have tryed mechanic in a can befor and never had any luck. However in this case it loosened up whatever valve was sticking or sealed whatever seal was leaking internally. I have about 500 miles on it since i poured in the honey like substance you make. It actually seams to shift and pull better than it did when it was just bebuilt. I would reccomend this product to anybody. It cost 10.00 for 1 bottle at advanced auto. Kinda pricey. But not when you consider the alternative.

Thanks ,

Dan A. Beck

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