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Sierra 4-Stroke 25W-40 Engine Oil is blended with premium grade synthetic and mineral based stock combined with superior designed additives formulated for the stress endured by sterndrive and inboard engines. This oil was developed for the marine environment and will outperform standard 4-cycle automotive engine oils. Sierra's 25W-40 oil offers excellent detergency, anti-oxidants, anti-wear, and corrosion protection. This oil provides numerous benefits for your boat engine including reduced wear of internal components, cleaner pistons, and it helps prevent ring sticking. Sierra 25W-40 oil also provides excellent low temperature operating properties.
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Sierra Oil Filter for Sterndrive and Inboard Engines Sierra oil filters are engineered with premium grade materials that will not only withstand but excel in the extreme environment of the marine...Add to Cart
Synthetic Blend Quicksilver/Mercury (25W-40) Engine Oil Specifically formulated and developed to meet the needs of: High-output sterndrive and inboard engines. Developed for the rigors of the...Choose Options
High Performance Synthetic Blend Gear Lube by Sierra Synthetic blended marine formulation reduces operating friction for increased performance and protection of gears, bearings and other gearcase...Choose Options