Mercury 150 HP Lower Unit # 8M0099218

Mercury 150 HP Outboard Lower Unit – OEM #8M0099218 | Four Stroke Long Shaft

Upgrade or replace your damaged drive with the Mercury 150 Outboard Lower Unit OEM #8M0099218 – a factory-original Mercury Marine part designed specifically for 150 HP Four Stroke outboards with a long shaft. Unlike aftermarket alternatives, this genuine Mercury 150 lower unit guarantees precision fit, factory performance, and long-term durability for your engine.

Whether you’re looking for a lower unit for Mercury 150 Four Stroke, a Mercury 150 Optimax lower unit, or even a replacement for a Mercury 150 Black Max lower unit, this OEM assembly provides a direct-fit solution built to handle demanding marine environments.

Perfect for restoring smooth shifting, reliable power delivery, and long-lasting protection, this Mercury 150 HP 4-Stroke lower unit offers superior quality at a value-driven price.

Features & Benefits:

• Fits Mercury Outboards 150 HP Four Stroke – Long Shaft
• OEM Part Number: 8M0099218
• 100% Factory OEM Mercury Lower Unit (not aftermarket)
• Precision-engineered for smooth gear shifting & reliability
• Covered by a 1-Year Mercury OEM Warranty

Pricing

• Retail Price: $4,535
• Our Price: $4,195 → Save $340
• Ask about available XL Units – Call or Email for details

Product Finish:

• Factory OEM Mercury Marine finish
• Built to OEM standards – ready to install
• Designed for long-lasting performance in freshwater & saltwater

Mercury OEM Unit: Core Rebate Information

• Return your old core, get up to $340 back
• Rebate amount will vary based on the condition of your core
• Recycle your core- keep boat parts out of the landfill

Useful Resources

• 🔍 How to find your Boat Engine serial number? 
• Still deciding? Watch our YouTube video How to avoid common lower unit replacement mistakes
• To help extend the life of your gearcase, check out our Boat Maintenance Checklist