Mercury – Quicksilver 5W-30 Full Synthetic Blend TDI Diesel Engine Oil, 4 Liters | Marine Engine Oil | Synthetic Blend | 8M0069602

Overview

There’s something deeply reassuring about knowing your diesel engine is protected by oil that’s built for the kind of punishment boating dishes out. When you start your TDI and feel that smooth, low rumble settle in, you know whether your oil is doing its job. Quicksilver 5W-30 Full Synthetic Blend TDI Diesel Engine Oil, part number 8M0069602, is the kind of oil boaters trust because it keeps their engines steady, cool, and responsive in conditions that would overwhelm ordinary automotive blends. It’s engineered for the long pushes offshore, the tight maneuvering in marinas, and the unpredictable weather that makes boating both challenging and rewarding.

Key Features

• Full synthetic blend formulated for TDI turbocharged direct-injection diesel engines

• Designed to resist thermal breakdown and oxidation under extreme marine heat

• Provides strong wear, sludge, and corrosion protection

• Meets international ACEA C3 requirements and exceeds API CH-4, CF-4, and SJ standards

• Supports longer life of diesel particulate filters

• Four-liter (one-point-six gallon) plastic bottle

• Mercury Marine part number 8M0069602

Engine & Boat Compatibility

• Ideal for Mercury and MerCruiser TDI diesel engines

• Suitable for other marine and non-marine diesel engines requiring five-weight thirty oil

• Commonly used in cruisers, cabin boats, heavy offshore hulls, diesel pontoons, and workboats

• Performs reliably in both saltwater and freshwater environments

Performance & Practical Benefits

Diesel engines thrive on stability — steady lubrication, clean internals, predictable heat control. This synthetic blend oil gives you all of that. You’ll notice it in the smoothness of your idle, the confident pull at low RPMs, and the way the engine stays cool and composed even during long stretches under load. The stay-in-grade formula holds its viscosity in temperatures that would break lesser oils down, which means your bearings, pistons, and turbo components stay protected through hard acceleration and extended cruising.

The corrosion protection is especially valuable for marine diesel owners. Salt air, humidity, and long layups can quietly eat away at internal components, but this oil forms a protective film that keeps moisture from becoming a long-term enemy. Its design also helps cut down on deposits and soot buildup, supporting better fuel efficiency and helping your diesel particulate filter last longer. It’s the kind of oil you rely on when you want an engine that feels tight, steady, and ready for anything the water throws at you.

Why Buy OEM

Genuine Mercury Marine oil isn’t just another diesel blend with a marine label — it’s engineered specifically for the demands of Mercury TDI systems. The tolerances, additives, and thermal stability are built around real-world marine conditions, not automotive assumptions. Aftermarket oils may meet the basics, but they rarely offer the same level of oxidation resistance, deposit control, or turbo-bearing protection. When you choose OEM, you’re choosing long-term reliability, fewer maintenance surprises, and the peace of mind that comes from knowing your engine is protected by the same people who designed it.

FAQ

Q1: Which engines does Quicksilver 5W-30 TDI Diesel Engine Oil fit?
It fits Mercury and MerCruiser TDI turbocharged direct-injection diesel engines and other diesel engines requiring five-weight thirty oil.

Q2: What makes this oil different from aftermarket options?
It’s built to withstand marine heat, moisture, and load demands with a stay-in-grade formula and strong corrosion protection.

Q3: How do I know if this is the right oil for my engine?
Check your engine manual. If it specifies five-weight thirty synthetic blend or ACEA C3 standards, this oil is a match.

Q4: Can this oil be used in both saltwater and freshwater applications?
Yes, it’s engineered for either environment, with additives that protect against moisture and corrosion.

Q5: Is installation straightforward for boat owners?
Absolutely. If you’re comfortable performing a routine oil change, this bottle pours smoothly and is easy to handle.