New Mercury 75–125HP Outboard lower unit - 3 CYL DFI/OPTIMAX 2004-2018 - New/Remanufactured image 0
New Mercury 75–125HP Outboard lower unit - 3 CYL DFI/OPTIMAX 2004-2018 - New/Remanufactured image 0

Mercury Outboard Lower Unit | 75-125 HP | 3-Cyl DFI/Optimax 2004-2018

$2,822.00
$3,132.42
$2,822.00
(-11%)
SKU: ME-G3-13-N
Please hurry! Only 100 left in stock
Subtotal: $2,822.00
New Mercury 75–125HP Outboard lower unit - 3 CYL DFI/OPTIMAX 2004-2018 - New/Remanufactured image 0

Mercury Outboard Lower Unit | 75-125 HP | 3-Cyl DFI/Optimax 2004-2018

$3,132.42 $2,822.00
New Mercury 75–125HP Outboard lower unit - 3 CYL DFI/OPTIMAX 2004-2018 - New/Remanufactured image 0

Mercury Outboard Lower Unit | 75-125 HP | 3-Cyl DFI/Optimax 2004-2018

$3,132.42 $2,822.00
Product Type: New Lower Unit
HP/Shaft/Years/Ratio: 115-125 OPTIMAX HP / L Shaft / 2004-2018

    Restore the legendary torque and efficiency of your Optimax with this Premium Aftermarket Replacement gearcase. Specifically engineered for Mercury 3-Cylinder DFI engines, this unit is built to handle the unique high-pressure demands of direct-injection technology. Featuring heavy-duty internal components and a precision-cast housing, it offers a cost-effective and reliable way to get back on the water with smooth shifting and peak hydrodynamic performance.

    • Optimax Optimized: Designed to match the specific gear ratios and torque curves of 75HP to 125HP DFI engines.

    • Rugged Construction: Built with high-strength alloys to ensure maximum longevity in both fresh and saltwater environments.

    • Bolt-On Ready: Arrives fully assembled for a fast installation, minimizing your downtime at the dock.

     

    • Brand: SEI
    • Part Number: SE90-205-D
    • Horsepower Range: 75 HP, 90 HP, 115 HP, 125 HP
    • Engine Displacement: 3-Cylinder DFI (Optimax)
    • Year Range: 2004–2018
    • Shaft Lengths: 20" (L) / 25" (XL)
    • Condition: Brand New Aftermarket
    • Build Quality: High-Strength Marine Grade
    • Engine Type: Mercury 75HP, 90HP, 115HP, and 125HP 3-Cylinder DFI/Optimax 2-Stroke.
    • Year Range: Fits models manufactured between 2004 and 2018.
    • Fitment Type: Direct replacement for original OEM units.
    • Shaft Length: Available in 20" (L) and 25" (XL) versions. You must confirm your transom height before ordering to ensure correct fitment.
    • Engine Series: This unit is strictly for 3-Cylinder DFI/Optimax models. It is not compatible with standard carbureted 2-stroke or 4-stroke models unless specified.
    • Maintenance: Always verify fluid levels and break-in procedures to maintain your 3-Year Warranty coverage.

    Mariners Warehouse vs Others

    Built to match OEM standards while delivering reliable performance and peace of mind.

    Features

    Mariners Warehouse

    Others
    Performance ✔️ ❌
    Warranty Support Reliable warranty Limited or unclear warranty terms
    Customer Trust Trusted by thousands of marine customers Unverified buyer trust
    Pre-tested before shipping for reliability ✔️ ❌
    OEM performance standards ✔️ ❌
    Simple return process ✔️ ❌

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