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


  • #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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Steve Hawkins uses Lucas Oil Stabilizer in '96 Buick Regal

i drive a 96 buick regal. it has nearly 200,00 miles on it now. when i bought it, when it had 60,000, i was looking for something to help the life of the engine. in the past i had tried all the major products but wasn't very satisfied with any of them. so i thought i'd try your prouct, lucas oil stabilizer. since owning the car, i have replaced the intake gasket twice, once at about 90,000 & about a month ago. both times i had taken the heads off to have them worked, but this last time i was cleaning some surface rust in the cylinders before i put the heads back on. after wiping the cylinders out i noticed something very strange in every cylinder. even tho i had almost 200,000 miles on the engine, there was absolutley no evidence of any wear in the cylinders. None! they looked like it had just rolled out of the factory. i've worked on cars & trucks for 30 yrs, & i have never seen an engine with those miles on it with no cylinder wear. i have to believe that that engine doesn't have any wear because of your product. i change my oil about every 5 or 6 k miles. but i always use abottle of your oil stabilizer with every oil change. my hat goes off to your product. if i could tell the world how great your stabilizer is, i most certainly would.

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