OEM MerCruiser 4-Stroke FC-W Synthetic Blend 25W-40 (1 gallon) marine engine oil engineered for Mercury and MerCruiser 4‑stroke engines. Quicksilver 8M0078623 25W40 marine engine oil specialized additive package outperforms automotive oils in marine environments, delivering the best wear and corrosion protection even under extreme RPM, high temperatures, and heavy loads.
Recommended by Mercury Marine and exceeds all marine engine oil requirements. Continued use helps eliminate thermal breakdown and ensures long-term protection during high-output operation.
This FC‑W Catalyst Compatible formula maintains peak engine performance and reliability without damaging emissions systems — safe for engines with or without catalytic converters.
For optimal results, pair with Quicksilver oil filters to match flow rate and filtration performance.
Ideal for routine oil changes, seasonal prep, and protecting your investment in harsh marine conditions.
OEM MerCruiser 4-Stroke FC-W Synthetic Blend 25W-40 (1 gallon) marine engine oil engineered for Mercury and MerCruiser 4‑stroke engines. Quicksilver 8M0078623 25W40 marine engine oil specialized additive package outperforms automotive oils in marine environments, delivering the best wear and corrosion protection even under extreme RPM, high temperatures, and heavy loads.
Recommended by Mercury Marine and exceeds all marine engine oil requirements. Continued use helps eliminate thermal breakdown and ensures long-term protection during high-output operation.
This FC‑W Catalyst Compatible formula maintains peak engine performance and reliability without damaging emissions systems — safe for engines with or without catalytic converters.
For optimal results, pair with Quicksilver oil filters to match flow rate and filtration performance.
Ideal for routine oil changes, seasonal prep, and protecting your investment in harsh marine conditions.