Quicksilver Oil Filter 858004Q for MerCruiser & Mercury 4.5/6.2L — Synthetic Media, Anti-Drainback

The Quicksilver 858004Q is a high-performance replacement oil filter engineered for MerCruiser sterndrive and GM/Mercury inboard engines to deliver reliable oil filtration and start-up protection.

This oil filter is designed as a direct-fit replacement for many MerCruiser sterndrive and inboard engines manufactured by General Motors and Mercury Marine (excluding V6 block-mounted filter configurations). Built to Quicksilver’s OEM-level standards, the 858004Q combines advanced synthetic filter media, a reinforced metal shell and anti-drainback protection to help keep marine engines cleaner and better lubricated during operation and at startup.

Which engines and applications will this filter work with?

The 858004Q fits MerCruiser sterndrives and inboard engines produced by General Motors, and also suits Mercury Marine 4.5L and 6.2L engines. It does not fit V6 engines that have the oil filter mounted directly to the engine block. Check your engine service manual or the original part number to confirm compatibility before ordering.

• Direct replacement for many MerCruiser sterndrive installations
• Compatible with Mercury Marine 4.5L and 6.2L engines
• Not compatible with V6 engines with block-mounted oil filters
• Meets Mercury Marine OEM specifications for form and fit

How does this filter protect the engine and improve longevity?

The filter uses high-efficiency synthetic media that captures the majority of oil-borne contaminants and particles, helping maintain cleaner oil circulating through bearings and moving parts. A robust anti-drainback valve preserves oil in the cartridge after shutdown, ensuring immediate lubrication on restart to reduce wear associated with dry starts.

• Synthetic media removes a high percentage of contaminants
• Anti-drainback valve keeps oil at the pump for instant lubrication
• Thicker corrosion-resistant metal shell resists deformation and rust
• Manufactured to OEM tolerances for reliable sealing and flow

What construction features make the 858004Q high performance?

Quicksilver designed this cartridge with a heavier-gauge metal shell—about 50% thicker than typical consumer filters—providing greater resistance to dents and corrosion in harsh marine environments. The synthetic filtration media offers consistent flow and contaminant capture, and the overall assembly is produced to meet stringent Mercury Marine original equipment standards.

• 50% thicker metal shell with corrosion-resistant finish
• High-efficiency synthetic cleansing media for long-lasting filtration
• Precision manufacturing to OEM specifications for fit and function
• Durable seals and valve components for reliable performance

How should I install and maintain this filter on my boat?

Replace the oil filter at regular service intervals or when performing oil changes according to your engine manufacturer’s schedule. Ensure the mounting surface is clean, lubricate the gasket lightly with engine oil, tighten to the recommended torque, and dispose of the used filter properly. Routine inspection of the anti-drainback valve and seal condition helps maintain peak protection.

• Follow engine manufacturer interval recommendations for oil and filter changes
• Lubricate gasket lightly before installation for a proper seal
• Tighten to specified torque—avoid over-tightening
• Recycle the used filter responsibly where facilities exist

Who is this product for? The Quicksilver 858004Q is aimed at boat owners, marine technicians and fleet operators who demand reliable, OEM-grade filtration for MerCruiser and compatible Mercury Marine engines. If you prioritize durable construction, high-efficiency synthetic filtration and start-up lubrication protection for sterndrive or inboard powerplants, this filter provides a proven, purpose-built replacement that aligns with Mercury Marine quality expectations.