Can you use synthetic oil in a Mercury 4-stroke outboard?
Can you use synthetic oil in a Mercury 4-stroke outboard? Synthetic Blend 4-Stroke (25W-40) Outboard Oil Mercury 25W-40 Synthetic Blend Outboard Oil meets the stringent marine operational requirements of all of Mercury’s new 4 and 6 cylinder models. First in class for all FC-W durability test properties with industry leading internal Marine engine corrosion protection. […]