Yamalube 4M 10W‑40 Mineral Outboard Oil – 1 Gallon (SKU LUB‑10W40‑WV‑04)

Your Yamaha spends its life at 4,500‑6,000 rpm in a salt‑spray bath—miles from the pampered world of car engines. Yamalube 4M is blended for that reality. This mineral‑based 10W‑40 formula carries the NMMA FC‑W badge, meaning it has passed the industry’s toughest tests for shear strength, corrosion resistance, and fuel‑dilution control. Yamaha then layers on a proprietary additive package that pushes those standards even higher, so bearings stay slick and cam lobes stay clean, hour after high‑load hour.

• FC‑W certified: built to survive constant high‑rpm running and moisture‑rich crankcases
• Proprietary anti‑corrosion additives: shields internals from rust during off‑season storage
• Shear‑stable base stock: oil film stays thick when the throttle stays down
• Compatible with professional oil analysis: pair with a Blackstone kit to monitor wear metals and catch issues early
• Convenient size: one‑gallon jug covers most routine oil changes

Pour in Yamalube 4M at your next service and you’ll notice smoother starts, steadier oil pressure, and the peace of mind that comes from using oil designed specifically for Yamaha outboards—not a repurposed automotive blend.