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Star Tron high-performance SAE 90 Lower Unit Gear Lube is engineered to protect lower units and sterndrives in both fresh and saltwater marine environments and extreme operating conditions.


Marine-Grade Wear Protection
Extreme Pressure (EP) oil additives protect hypoid gears during fast acceleration and under heavy loads, mitigating shock loads and reducing excessive wear.


Long-Lasting Rust & Corrosion Barrier
Prevents rust and corrosion formation in between use and during short- and long-term or winter storage.


Marine Environment Ready
Designed specifically to operate even in the presence of water intrusion, unlike many automotive gear lubes and oils.


Marine-grade, Lower Unit Gear Lube oil is recommended for use in these applications: API GL-4, GL-5, API MT-1, SAE J-2360, MACK GO-J and is compatible with most gear lubes. Also approved for use in applications requiring 80W-90 and meets all Engine Manufacturer Warranties.


Refer to Owner’s Manual for proper flushing and filling procedures:
1. Remove upper and lower unit gear case plugs to drain old lube.
2. Install the fill tube (sold separately) into the lower hole.
3. Slowly refill with new fluid until lubricant appears at the upper hole.
4. Replace the upper plug before removing the fill tube from the lower hole.
5. Remove the fill tube and reinstall the lower plug.
6. Tighten all plugs securely


Includes one  (1) quart of Star Tron high-performance SAE 90 Lower Unit Gear Lube.


Star Tron high-performance SAE 90 Lower Unit Gear Lube replaces Mercury 92-858064K01, 858064K01, 802854A1

StarTron Lower Unit Gear Lube

SKU: ST-77
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