Synthetic 50 WT Trans Oil

Lucas Oil Products, Inc.

Synthetic 50 WT Transmission Oil

Lucas Synthetic 50 WT Transmission Oil is designed especially for heavy duty truck transmissions but can be used in many other applications.

Common gear oils are mostly base stocks with little more than an addition of sulfur and phosphorus as a total anti-wear package. We at Lucas Oil Products consider this inadequate. Most heavy duty truck transmission manufacturers now consider sulfur and phosphorus to be potentially corrosive to copper and brass and consequently recommend against common gear oils for this reason. The other 50 WT we have tested, synthetic or otherwise, are pure base stock, we consider this also inadequate.

Lucas Synthetic 50 WT contains an exclusive additive concentrate derived from synthetic oil that ensures lower operating temperatures and better lubrication, especially to upper bearings and gears. This is a long lasting fluid that is far superior to conventional synthetic fluids and contains nothing that could be harmful.

Meets or exceeds API MT-1, Eaton Transmission Div., 164 rev 7, Mack Truck TO-A Plus, International Truck TMS 6816 and other applications requiring non-EP Lubricants.

Key Benefits

  • Long lasting fluid
  • Ensures lower operating temperatures and better lubrication
  • Contains an exclusive additive concentrate


  • #10146 - 1 Gallon (Case of 4) - 33 lbs
  • #10147 - 5 Gallon Pail (1 Pail) - 40 lbs
  • #10149 - 55 Gallon Drum (1 Drum) - 440 lbs
  • #10561 - Per Gallon Tote (1 Tote)


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

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Amazingly everything was fixed for real!

Bought a used Pontiac Montana 2003 with a 123,000 Km, to use it for daily delivery (avg.400 Km/day). After a while, the transmission slips on first gear when I push on gas quickly but didn't make a big issue of it. Around 280,000 Km my transmission started knocking on shifts, then hard shifting and slipping. I thought it's time for goodbye! I changed oil but didn't work. Since I already had great experience with Lucas Oil Stabilizer and Fuel additive and to say 'at least I tried', I added one bottle of Lucas Transmission Fix to existing as recommended. Hard shifting was gone right away! Slipping became less severe but not fixed and knocking remained too. Again had nothing to lose, I added another bottle as recommended by Lucas, (although my mechanic blasted at me that it could be too much of liquid volume), but I trusted Lucas and gave it a shot. It didn't work right away and thought that's it! Until after like 3000 Km, amazingly everything was fixed for real! Even the 1st gear old slipping was gone! My transmission became better even when I bought that van! This product is not an additive, it's like haunted by a mechanic! My van is now 545,000 Km and sill working pretty awesome! To further detail my experience, knocking and slipping returned to me around 475,000 Km so I changed oil and added two Lucas bottles right away, and was fixed on 1st day driving on my way back! It was even a better surprise:) The least I could do to show my appreciation to the only honest additives company in the world, is share my experience! Thank you Lucas guys, you saved me thousands of dollars... -Firas K.
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