Extreme Duty Marine SAE 20W-50 Engine Oil

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Extreme Duty Marine SAE 20W-50 Engine Oil

Lucas Extreme Duty Marine SAE 20W-50 Engine Oil is designed for use in high performance boats requiring the ultimate protection.

Lucas Extreme Duty Marine SAE 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 SAE 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

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* Size:


  • #10653 - 1 Quart (Case of 6) - 13 lbs
  • #10810 - 5 Quart (Case of 3) - 31 lbs
  • #10665 - 5 Gallon Pail (1 Pail) - 40 lbs
  • #10666 - 55 Gallon Drum (1 Drum) - 440 lbs


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

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Mark Benninghoff uses Lucas Heavy Duty Oil Stabilizer for 1994 Ford F-250

I have been using your products since 1991, changing my oil around 3500 miles, I'm happy to say I hit 200,000 miles while pulling a loaded fifth wheel horse trailer through the mountains. This is quite a mile-stone for this vehicle. It is a 1994 Ford F-250 with a 5.8 litre gas engine/automatic, not your typical heavy tow vehicle. She is all original except for the starter and tune-ups and runs like new, absolutely no engine noise. This is my city jobsite/out on the town and everyday driver. Nobody believes the miles on this vehicle, thanks to Lucas Oil Stabilizer, which was added at every oil change, I have no doubt I can go another 200,000.

Also have been using this in a 1994 E-150 300 six cyl. It is in the city of Chicago almost everyday and has 186,000 miles on her. My father has a 1957 Christ-Craft powerboat with a 131 h.p. 6 cyl. It began to puff a little blue smoke at start up a few years back, now that we’re using the Oil Stabilizer and Upper Cylinder Lube the problem is gone. The mechanics at the marina were so impressed, they’re using it on the classic boats now.


Mark Benninghoff

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