Synthetic SAE 75W-90 M8 Marine Gear Oil

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Marine Gear Oil Synthetic SAE 75W-90 M8

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Lucas M8 Synthetic SAE 75W-90 Marine Gear Oil is a pure synthetic, non foaming, super slick, long lasting lubricant designed especially for marine applications. Originally designed for high powered off shore racing boats, M8 Marine Gear Oil contains seal conditioners and an exclusive blend of synthetic additives that protect from rust and wear caused by both fresh water and salt water during long periods of storage.

Excellent for use in any heavy duty / high performance stern drives, v-drives, gear boxes, wheel bearings and superchargers.

Key Benefits

  • Fortified with anti-foaming agents to prevent cavitation at high RPM's
  • Safely blends with all other known gear oils and additives
  • Protects against rust and moisture during long periods of storage
  • Provides rust and corrosion protection in both fresh water and salt water environments
  • Effective Water Resistance
  • Long Lasting
  • Resist Extreme Pressure
  • Extreme Friction Reducer


  • #10652 - 1 Quart (Case of 12) - 25 lbs
  • #10664 - 5 Gallon Pail (1 Pail) - 40 lbs


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

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Shamus Hogan uses Lucas Transmission Fix

I have an old 1986 Toyota pickup in great shape...except for an annoying hard shift in first and second gear. I had done some reading on what the causes might be for this..and ended up replacing the shift lever seat and bushing thinking this would solve my problem. It did not.

So, i stopped down at my local Napa shop, and they suggested i add a bottle of your transmission fix to my existing transmission oil. I added the bottle last night and took my first drive today.

All i can say is "WOW!!!". This stuff really works!! I instantly felt a difference. I used to have to ease into first and second gear gently to find that sweet spot where the truck "wanted" to shift. Now i can shift when i want with no resistence. It's amazing to me that a bottle of your transmission fix could have such a drastic result. Now first and second feel as easy to shift as every other gear.

Thank you Lucas Oil!!! Your products are amazing!!

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