Quicksilver Oil Filter for MerCruiser GM Engines (Universal Fit, Part 35-866340Q03)

The Quicksilver 35-866340Q03 is arguably the most popular “all-round” oil filter for MerCruiser, as it covers the majority of the brand’s gasoline engines based on General Motors blocks. Whether you have a smaller 4-cylinder engine for a family runabout or a big V8 for a sport cruiser, this filter is likely the one specified by the manufacturer. It’s designed to meet the needs of engines of various displacements and outputs, making it a universal solution for servicing mixed fleets and marine workshops.

What makes the Quicksilver 866340Q03 so versatile and reliable:

• One Filter – Many Engines: This filter model is used in everything from the 4-cylinder MerCruiser 3.0L (common in 17–19 ft boats), through popular V8 engines like the 5.7L (350 MAG), up to the modern 6.2L MerCruiser, as well as Mercury’s own 4.5L and 6.2L engine blocks that succeeded the GM blocks. This means if you run a service shop or own multiple different boats, the same filter can serve many of them
• Maintains High Performance: Powerful V8s (such as the 6.2L) generate significant power and need flawless lubrication. The 866340Q03 has a large filter surface area and an internal bypass valve with the correct specifications to ensure that even at high RPM and pressure, the engine won’t starve for oil. At the same time, the filter efficiently removes particles, extending oil life and intervals between oil changes
• Meets Rigorous Standards: As a genuine part, this filter has been tested by Mercury for durability and effectiveness under marine conditions. This includes operation at high temperatures in the engine bay, resistance to salty air and spray, and shock from waves. Therefore, it won’t loosen or fail under prolonged use – critical during long boat trips
• Easy Choice for Maintenance: For owners who prefer to service their boats themselves, having this universal filter simplifies things – there’s no guesswork about which model you need. You just need to know your engine is a MerCruiser (GM-based) and not an odd exception covered by a different filter. Replacement takes only minutes and gives peace of mind for many more hours of boating
• No Quality Compromises: While many aftermarket “universal” filters are available, the Quicksilver 866340Q03 is uncompromising – it delivers the best filtration quality for your engine. This translates to steadier oil pressure, smoother engine operation, and prevention of costly damage (like stuck piston rings or worn camshafts due to dirty oil)

In summary, Quicksilver 866340Q03 is the “gold standard” oil filter for MerCruiser engines from the last few decades. If your boat – be it sporty or for leisure – relies on a gasoline MerCruiser (GM-based) engine, this filter will help it run smoothly. Replacing your filter regularly with an OEM one ensures your time on the water is spent enjoying the ride, not dealing with mechanical issues.