Extreme Duty Marine Semi Synthetic 20W-50 Engine Oil

Lucas Oil Products copy

Extreme Duty Marine Engine Oil Semi Synthetic SAE 20W-50

  • {irecommend}

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

get adobe reader

Darren Bell uses Lucas Power Steering Stop Leak for 1986 Chevy S-10

Dear Lucas Oil,

I have a 1986 Chevy S-10 pick-up that "was" leaking power steering fluid out the front seal of the pump so badly it left trails across the hood and the fender well. Not to mention getting on the exhaust manifold. I had to add fluid everytime I drove it anywhere.

I saw your commercial on TV and bought some stop leak to try it out. I drained old fluid from the pump reservoir and added Lucas Power Steering Stop Leak and in just two days of driving the leak stopped. I haven't had to add any fluid for a month now.

I am sold and a believer in your wonderful, money saving products! I do my own auto repairs and the less the better. Especially costly leak repairs.

Thank you very much,

Darren Bell

Coos Bay, Oregon

Share Your Lucas Oil Story