Extreme Duty Marine SAE 20W-50 Engine Oil

ws-logo shield text

No View Cart

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

Buy Online

* 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

Click here to get Adobe Reader

Tony Gardmen uses Lucas Heavy Duty Oil Stabilizer in

First let me say that I am asking for nothing. I just wanted to write this and say you "Stuff Kicks Ass"!!! : ) I moved here, in Colorado back in 1996. I am a mechanic by trade and alway looking for a new prize. Seem Lucas in alot of hot rod mags, but I was a STP man. Anyway I found it and used it and it was cheap. But damn did that stuff work. And I use it in everything. Some guy saw me putting some in my motorcycle, and told me hey thats for cars. I told nosy that I have been putting this in my bike for "8" years and it runs "great". Bet he does now :)

Weedeater, lawn mower, hell I even add some to one of my "RC Racers." Runs damn fine. "Thanks For A Great Product :) "Will never change back"!!! "One Very Happy Lucas Man" :)

Share Your Lucas Oil Story