Extreme Duty Marine Semi Synthetic 20W-50 Engine Oil

Lucas Oil Products, Inc.

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) - 946 mL



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

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We are so glad we tried your products.

Dear Lucas Oil Products.
When people read about the claims of products, they are skeptical.  We are so glad we tried your products.  
First- Your Fuel Injector Cleaner We Drive a 2000 Chevy Blazer.  When the motor starts surging at idle all my husband has to do is add the recommended amount and the problem is gone.  Plus we get better gas milage.  
Next- Your Engine Oil Stop Leak The hoses for the remote oil filter on the Blazer were leaking.  We debated whether we wanted to replace them.  My husband added a quart of the Stop Leak at an oil change and the leaking stopped.  Now he adds one at every oil change.
And Now- Your Transmission Fix We have a 1971 Corvette.  The trans was slipping.  Again, all we had to do was add some and the problem was gone. 
One Last Thing- Our nine year old granddaughter races a Jr. Champ Kart.  IF you ever came out with anything to increase horse power let us know.
All of your products are really really outstanding and we promote their use with the people we know.
We also talk to the guys at Napa, where we buy them, to pass on the great performance of your products.
Thanks so much,

Rich & Connie 

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