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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Moe Arami Uses Stabilizer to Help Pass Emissions Testing

I have a near factory stock original ‘78 Jeep CJ7 with a factory 304/3 speed. It has approximately 90,000 miles on it, and I have had nothing but problems over the years with emissions testing. Not anymore. I had some blow by and every year I had a ritual that I would have to go through to get it to pass. This year I did my regular tune-up, Oil/Filter change but added Lucas Oil (stabilizer). I could not believe it when the tester came over to me with my paperwork and said man this Jeep runs clean. I looked at the readings and could hardly believe my eyes. HC loaded 38 at idle 2. CO loaded .07 at idle .00. Last year’s testing without Lucas Oil was approximately: HC loaded 223 at idle 185, CO loaded 1.3 and at idle 1.48.


Moe Arami

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