How to Easily Change Gear Oil on Mercury Outboards Using the Quicksilver Gear Lube & Pump Kit

Maintaining your outboard engine is essential for long-term reliability and performance, and one of the most important yet overlooked maintenance tasks is changing the gearcase oil. Mercury recommends regular lower unit oil changes to prevent wear, corrosion, and damage. Fortunately, with the Quicksilver 1L Premium Gear Lube & Pump Kit, it's now easier than ever to do this job yourself – even dockside.

Why Use Quicksilver Gear Lube?

The SAE90 Premium Gear Lube in this kit is specially formulated by Quicksilver – the OEM supplier for Mercury – to offer:

• Superior anti-wear protection under high loads and marine operating conditions
• Excellent water separation to protect against emulsification and corrosion
• Stable viscosity even in extreme temperature changes

This makes it the perfect choice for Mercury outboards, particularly those up to 60HP, which are widely used in both leisure and commercial boating across the UK.

What’s in the Kit?

• 1L bottle of Quicksilver SAE90 Premium Marine Gear Lube
• Durable gear oil pump with flexible tube
• Metric thread adapter for Mercury outboards

Everything you need is included – just bring a screwdriver and a drain pan.

Step-by-Step: How to Change Your Gearcase Oil

1. Warm up the engine slightly to loosen the oil.
2. Place a drain pan beneath the lower unit.
3. Remove the lower drain plug (bottom of the gearcase) and then the upper vent plug.
4. Allow old oil to drain completely – inspect for water or metal shavings.
5. Attach the pump to the 1L Quicksilver bottle and insert the tube into the lower drain hole.
6. Pump oil until it flows steadily from the top vent hole.
7. Quickly insert the top plug, then remove the pump and insert the lower plug.

That’s it! With the Quicksilver pump, you avoid messy spills and awkward positioning. It threads directly into the lower unit, ensuring a secure and efficient fill.

Trusted by UK Boat Owners

This kit is one of our bestsellers at 4boats.co.uk, and for good reason. It’s genuine OEM quality, affordable, and makes one of the most crucial maintenance jobs fast, clean, and DIY-friendly. Whether you’re prepping for winter, summerising your boat, or doing routine service – this gear lube kit is a must-have for Mercury owners.

Where to Buy

You can order the full kit directly here: Quicksilver Gear Lube & Pump Kit – 4BOATS UK. We offer fast UK dispatch and a full range of Mercury-compatible service parts.

Protect your outboard – perform regular gear oil changes with confidence. Shop trusted marine parts at 4boats.co.uk.