Extreme Duty Marine Semi Synthetic 20W-50 Engine Oil

Lucas Oil Products, Inc.

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

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 severe 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


  • #10654 - 1 Quart (Case of 6) - 13 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

Evan Myklebust uses Lucas Transmission Fix in 1994 Ford Ranger

I bought a used Ford Ranger for a commuter a little while ago with a slow transmission leak. The previous owner would add fluid when the trans started making noises. ( I found this out a few months after I had been driving it ) I did this a few times and had run across Lucas stop-slip so I thought I would give it a try even though I had a manual trans. I put a bottle of stop-slip and two bottles of gear oil ( yes I know that it is susposed to have ATF ) and within 50 miles all the noises from the transmission have completely disappeared. I drive 60 miles a day for work and have put 10,000 miles on the truck since I put your product in and I'm definitley a customer for life.

Thank you, thank you, thank you!

Evan Myklebust

Oakland, CA

Share Your Lucas Oil Story