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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Toby Harris uses Lucas Transmission Fix in 1996 Ford Taurus lx

Unbelieveable. My tranny was slipping not shifting into 2nd gear and had heavy resistance when driving, my mechanic gave it the death certificate and told me it would be $1800 to replace. I was out of options I flushed the transmission $70 and that still didn't do the job properly. I then pony'd up the $9 for your product, $2 for a tranmission funnel to fit the dip stick tube and $2 for some brake cleaner, yes you read that correctly $83 total to correct my problem. Your product took 25 minutes with engine idiling to work into the transmission, I drove it for 30 minutes and problem solved. Your product is seriously a lifesaver and saved me thousands in repairs, this is the product that the auto repair industry does'nt want you to know about.

Thank you so much,

Toby Harris

Manhattan Beach,CA

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