Sierra 25W-40 4-Stroke Catalyst Marine OilThis Sierra Premium Blend Engine Oil meets modern recreational 4-stroke engines with or without emission catalyst systems. Sierra 25W-40 is approved for all 4-stroke applications including outboard, sterndrive, and inboard.Features: Exceeds all 4-stroke requirements including FC-W and FC-W Cat Compatible; Formulated to offer maximum corrosion protection; Advanced lubrication for extended engine life and wear protection; "ZDDP" anti-wear additive technology; Prevents phosphorus depletion and extends the emission catalyst life; NMMA FC-W Certified; Developed for the marine environment and will out perform standard 4-cycle automotive engine oils; Offers excellent detergency, anti-oxidants, antiwear, and corrosion protection; Excellent low temperature operating properties; How much oil does my engine need?It varies model to model, check out our Engine Oil Capacity Guide for more information and capacity charts!// Interchangeable with: Mercury Marine: 92-8M0078627;