Extreme Duty Marine SAE 20W-50 Engine Oil

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Extreme Duty Marine SAE 20W-50 Engine Oil

Lucas Extreme Duty Marine SAE 20W-50 Engine Oil is designed for use in high performance boats requiring the ultimate protection.

Lucas Extreme Duty Marine SAE 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 SAE 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:


  • #10653 - 1 Quart (Case of 6) - 13 lbs
  • #10810 - 5 Quart (Case of 3) - 31 lbs
  • #10665 - 5 Gallon Pail (1 Pail) - 40 lbs
  • #10666 - 55 Gallon Drum (1 Drum) - 440 lbs


Product Spec Sheet Technical Data Sheet
Safety Data Sheet Safety Data Sheet

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Laurence Mardon uses Lucas Fuel Treatment in Mazda RX-7 -- 1st generation w 2nd gen. turbo swap

I run a beautiful first generation Mazda RX-7 with a 2nd generation turbo engine swapped in. The first gen RX-7 (and the third) was a pure driver's car: great handling and -- with the turbo -- very nice performance.

I've made a number of modifications and tried different doo-dads, but I'm just writing to say that one of the most effective is your Upper Cylinder Lubricant with Injector Cleaners.

I've used it for the last 5 or 6 fill-ups and I'm very impressed: my engine is running much smoother, with a beautiful note to it when I pull away from the traffic behind me.

Great work, Lucas, whoever you are!


Laurence Mardon

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