---
product_id: 18858215
title: "Quicksilver 25W-40 - Gallon"
brand: "quicksilver"
price: "¥21342"
currency: JPY
in_stock: null
reviews_count: 8
category: "Quicksilver"
url: https://www.desertcart.jp/products/18858215-quicksilver-25w-40-gallon
store_origin: JP
region: Japan
---

# 25W-40 viscosity for optimal engine flow Superior corrosion & wear protection Specifically engineered for 4-stroke marine engines Quicksilver 25W-40 - Gallon

**Brand:** quicksilver
**Price:** ¥21342
**Availability:** ❌ Out of Stock

## Summary

> 🛥️ Power your marine adventures with Quicksilver — where performance meets peace of mind!

## Quick Answers

- **What is this?** Quicksilver 25W-40 - Gallon by quicksilver
- **How much does it cost?** ¥21342 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/18858215-quicksilver-25w-40-gallon)

## Best For

- quicksilver enthusiasts

## Why This Product

- Trusted quicksilver brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Trusted Industry Leader:** Backed by Quicksilver’s 65+ years of marine expertise and rigorous testing for unmatched quality assurance.
- • **Engine Longevity Booster:** Advanced corrosion resistance and wear protection keep your 4-stroke outboard running smoother, longer.
- • **Marine-Grade Performance:** Direct OEM replacement for Mercury Marine 8M0078628 ensures perfect compatibility and peak engine reliability.
- • **Optimized High-RPM Formula:** Special viscosity modifiers tailor performance for high-revving marine engines, maximizing power and efficiency.
- • **Effortless Maintenance Upgrade:** Meets and exceeds all marine 4-stroke oil standards including FC-W and catalyst compatibility for worry-free use.

## Overview

Quicksilver 25W-40 is a premium marine engine oil designed for 4-stroke outboard and sterndrive engines. It delivers superior corrosion resistance and wear protection, meeting Mercury Marine OEM specs and all marine industry standards. Trusted for over 65 years, this oil optimizes high-rpm engine performance, ensuring long-lasting reliability and peak power on the water.

## Description

Clean oil is essential in reducing friction and preventing damage to internal components, providing many years of engine life. Engineered for sterndrive and outboard applications, this 25W-40 4-stroke marine engine oil has been extensively tested to ensure impressive protection against corrosion and wear. Exceeds all marine industry 4-stroke oil requirements including FC-W and FC-W catalyst compatible. The Quicksilver brand is the leader in delivering uncompromising engine oils, parts and accessories to the marine industry for over 65 years. Quicksilver is the premier supplier of Mercury Marine original equipment replacement engine parts, oils, and accessories, but also works to serve all original equipment brands in the marine and powersports industries. It has earned a loyal following by providing the highest quality products that are tested through some of the most rigorous environments and testing procedures. No aftermarket company comes close to the level of research and design as Quicksilver; buying Quicksilver is buying performance, protection and peace of mind.

Review: Perfect for my application. - Works as advertised
Review: Good price - Work in my engine and good price

## Features

- Direct replacement for Mercury Marine 8M0078628
- Designed for use in 4-stroke marine engines
- Formulated to provide superior corrosion resistance and wear protection to maintain peak engine performance and reliability
- Special viscosity modifiers help to optimize the performance of high-rpm 4-stroke outboard motors
- 25W-40 viscosity
- Produced to meet Mercury Marine original equipment manufacturer specifications to best protect your outboard
- Manufacturer part number 8M0078620

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00N6DF8SW |
| Best Sellers Rank | #4,493 in Automotive ( See Top 100 in Automotive ) #81 in Motor Oils |
| Brand Name | Quicksilver |
| Compatible with Vehicle Type | Marine Vehicles |
| Container Type | Bottle |
| Customer Reviews | 4.8 out of 5 stars 4,238 Reviews |
| Global Trade Identification Number | 00745061915527 |
| Included Components | End Product & Information |
| Item Height | 11.8 inches |
| Item Type Name | 25W-40 Oil |
| Item Weight | 7 Pounds |
| Liquid Volume | 128 Fluid Ounces |
| Manufacturer | Quicksilver |
| Manufacturer Part Number | 8M0078620 |
| UPC | 745061915787 745061915527 |
| Unit Count | 128.0 Fluid Ounces |
| Viscosity | 25w-40 |

## Product Details

- **Viscosity:** 25w-40
- **Brand:** Quicksilver
- **Liquid Volume:** 128 Fluid Ounces
- **Package Information:** Bottle
- **Vehicle Service Type:** Marine Vehicles

## Images

![Quicksilver 25W-40 - Gallon - Image 1](https://m.media-amazon.com/images/I/61DkqhBDE5L.jpg)

## Available Options

This product comes in different **Pattern, Style** options.

## Questions & Answers

**Q: is this oil full synthetic**
A: This product is a mineral based oil. “ The NEW mineral 4-Stroke oil is also now approved for use in all outboard engines; previously only our syntetic blend could make this claim”
Quicksilver makes a synthetic and it states synthetic on its lable.

**Q: What's the difference between mercury oil**
A: It is the same as Mercury oil.  Quicksilver is the Mercury lubricant brand and has been for years.

**Q: Is this for 01 bayliner Ccapri 4 cilinder**
A: If it has mercruiser motor.

**Q: How do I know if motor is 2 or 4 stroke? Basic Mercury 125 pontoon motor**
A: Look on the engine and your book if you got one.  It will tell you if 2 or 4 stroke

## Customer Reviews

### ⭐⭐⭐⭐⭐ Perfect for my application.
*by T***C on December 12, 2025*

Works as advertised

### ⭐⭐⭐⭐⭐ Good price
*by P***S on November 27, 2025*

Work in my engine and good price

### ⭐⭐⭐⭐⭐ exact oil for my boat...specially made for boats
*by P***F on February 3, 2025*

I say that, because you might think that this is pricey for "regular" motor oil. It is not regular. This oil had additives in it that help suspend water. Why? well, the reason is that if you are out to sea, a long way from home, and you blow a head gasket, this oil will suspend and absorb water, and keep your engine lubed until you get back. Case in point...I had a leak in my intake manifold that filled my crankcase with water. When I checked the level, it was 3 quarts over full, and white soup. The water wasn't just sitting in the bottom of my oil pan, getting sucked up into my main bearings as water, and cooking all the internals. The engine ran just fine all the way home. This is why you use genuine boat parts!

## Frequently Bought Together

- Quicksilver by Mercury Marine 25W-40 Marine Engine Oil
- Quicksilver 866340Q03 Oil Filter for MerCruiser Sterndrive and Inboard Engines
- Quicksilver 802893Q01 Water Separating Fuel Filter for Mercury and Mariner Outboards and MerCruiser Stern Drive and Inboard Engines

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-02-08*