Mercury Antifreeze -100°F 55 Gallon Drum | 8M0073204

Mercury Marine Antifreeze – 55 Gallon Drum | Part 8M0073204

Part Number: 8M0073204
Brand: Mercury Marine / Quicksilver
Official Product Type: Marine Water-System Antifreeze
Container Size: 55-Gallon Drum (208 L)
Formula: Non-toxic propylene glycol blend
Temperature Rating: Burst protection to -100°F (-73°C) | Freeze protection approx. -58°F to -63°F (-50°C to -52°C)

Looking for the single-gallon version? See Mercury Antifreeze -100°F 1 Gallon | 8M0073203.

What It Does

This is a water-system antifreeze designed for seasonal winterization — not an engine coolant for closed-cooling systems. It displaces water from raw-water cooling passages, livewells, wash-down systems, and onboard plumbing to prevent freeze damage during off-season storage. The blue-green dye lets you visually confirm the antifreeze has fully circulated through the system. The 55-gallon drum format is designed for marine service shops and high-volume winterization operations.

Key Features

• Burst protection to -100°F (-73°C)
• Freeze protection approx. -58°F to -63°F (-50°C to -52°C)
• Non-toxic propylene glycol — safe for raw-water and potable water systems
• Inhibits corrosion of aluminum, copper, brass, and solder
• Compatible with rubber seals, gaskets, and hoses
• Blue-green dye for easy visual confirmation during winterization
• Genuine Mercury Marine / Quicksilver OEM formulation
• 55-gallon drum — ideal for shop or fleet winterization volume

Compatible Applications

Designed for winterizing raw-water cooling systems, livewells, and onboard plumbing on:

• Mercury Outboards — 2.5HP through 400HP (FourStroke, Pro XS, Verado, SeaPro)
• MerCruiser Sterndrives — 3.0L, 4.3L V6, 5.0L V8, 5.7L V8, 6.2L V8, 7.4L V8, 8.2L V8
• MerCruiser Inboard engines with raw-water cooling
• Livewell and baitwell systems
• Freshwater plumbing and wash-down systems on boats
• Raw-water cooling systems on RVs and marine vessels

System

Raw-water cooling system / water-system winterization. Not for use in closed-cooling (freshwater) engine systems — those require a separate engine coolant. Always follow the manufacturer's winterization procedure for your specific engine model.

Dimensions

Standard 55-gallon steel drum — approximately 22.5" diameter × 34.5" H. Filled weight: approx. 210 kg (463 lbs). Drum pump or dispensing equipment required for use; not included.

Related Parts

Commonly used together during winterization and cooling system service:

• Mercury Antifreeze -100°F 1 Gallon | 8M0073203 — single-unit retail size
• Mercury Quicksilver Outboard Flushing Attachment 12612T2 — flush before winterizing
• FlushMaster Flush Port Quick Connect – Mercury Outboard
• Mercury Water Pump Impeller 19453T — replace impeller at winterization
• Mercury MerCruiser Water Pump Repair Kit 8M0135821
• Mercury MerCruiser Thermostat Kit 807252T5
• Mercury Quicksilver High Performance Gear Lube 858058KC1 — complete winterization service

Service Interval

Use annually at the start of each winterization / lay-up season. Replace with fresh antifreeze each season — do not reuse antifreeze from the previous year. Flush the system thoroughly with fresh water before re-commissioning in spring.

Technical FAQ

Can I use this in a closed-cooling system?
No. This product is for raw-water and water-system winterization only. Closed-cooling systems require a separate ethylene or propylene glycol engine coolant rated for that application.

Do I dilute this antifreeze?
Generally used full-strength for winterization. Always follow the specific winterization procedure in your engine's service manual for correct application and volume.

Is it safe if it enters the water?
Yes — the propylene glycol formula is non-toxic and environmentally safer than ethylene glycol antifreeze, making it appropriate for marine use near water.

How do I know it's circulated fully?
The blue-green dye will be visible at the water outlet when the antifreeze has fully displaced water from the system.

What do I need to dispense from the drum?
A drum pump or barrel pump is required to dispense from the 55-gallon drum. This is not included. Ensure your pump is compatible with propylene glycol solutions.

Parts Desk Insights

Best use case: High-volume marine service shops and dealerships performing seasonal winterization on multiple outboards and sterndrives. The 55-gallon drum significantly reduces per-unit cost compared to individual gallons and eliminates the need to manage multiple containers during a busy fall haul-out season. One gallon typically covers a single outboard or sterndrive winterization, so a drum supports approximately 50+ service jobs.

Common mistakes:

• No drum pump on hand — the drum cannot be poured directly without a pump or dispensing tool. Order a compatible drum pump before the drum arrives.
• Using this in a closed-cooling system — it is not formulated for that application. Use a dedicated engine coolant instead.
• Skipping the flush step — always flush the system with fresh water before introducing antifreeze to remove salt, debris, and contaminants.
• Reusing last season's antifreeze — inhibitors degrade over time. Use fresh antifreeze each season for reliable protection.
• Not confirming full circulation — watch for the blue-green dye at the outlet before shutting down. If you don't see it, the antifreeze hasn't reached all passages.