Extreme Duty Marine SAE 20W-50 Engine Oil

Lucas Oil Products, Inc.

Extreme Duty Marine Engine Oil SAE 20W-50

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 severe 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 engine
  • Safely blends and is compatible with synthetic and non-synthetic oils
  • Petroleum and semi-synthetic SAE 20W-50 grades
  • Contains effective anti-wear agents, detergents, Lucas unique additive chemistry and friction modifiers (molybdenum) to provide the ultimate performance
  • Proven performance in marine applications
  • Compatible with methanol and all racing fuels
  • Zinc and phosphorous chemistry provides excellent boundary lubrication at start up (contains 0.31% zinc)
  • Conventional grade is factory fill for ILMOR high performance engines


  • #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
zinc Zinc Values

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Jerry Lambeth uses Transmission Fix in his 91 Dodge B250 Van.

Have a 91 Dodge B250 van. Local mechanic back-flushed transmission instead of replacing filter and fluid like I asked. Needless to say that is when I started having problems such as slipping and eratic shifts especially when in overdrive, could hardly pull a hill. He stated that this was a common problem with Dodge, he assumed because the odometer read 140+ miles that the torque convertor was the problem or the catalitic convertor and would not even look at the problem. He not knowing that we just two years before had the transmission professionally rebuilt all the way through with a new torque convertor. Being half- way mechinically minded I could not see how it was the cat/convertor or the torque convertor since we had no problems before we took in for oil/trans/filter and state inspection. So since he would not deal with the problem I changed the trans fluid and filter and still had a slipping problem, figuring he dislodged some trash somewhere and it was now stuck in a valve, so I decided I had nothing to lose and purchased your transmission repair. I added the entire contents in Advance Auto's parking lot, reading the part "Effects Felt Immediately", yeah right I thought, but like I said I had nothing to lose. Sure enough by the time I went around the corner out of the lot and pulled onto the highway the tranny shifted just as if it were brand new, being a heavy van it still would not spin the wheels but there was an immediate effect of good pulling ability and shifting points. Not to long, not to short, but sharp points, the down shifts were also greatly improved. The first hill I encountered only a 1/2 mile away would be where the real test would come in, usually the van would drop out of O.D. and really slip and the engine rev up while pulling this hill. Wow stayed in O.D. no drop in mph or or higher rpms. Pulled great. I still believe that this deal of back flushing should include the filter being changed, I can't see taking a chance of breaking loose particiles in tranny without changing a $12 filter & gasket. Next time I will change filter & fluid myself and add a bottle of your tranmission additive myself. Would not have believed it if I had not done it myself, I have always been against adding other fluids thinking if that they actually worked the oil companies would add them themselves, was I wrong. Thanks you may have saved me a lot of money even without anyone looking at tranny.

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