Mercury SAE 85W-90 Racing Gear Lube - Qt. Mercury Racing Gear Lube is formulated for outboard and sterndrive racing applications. Mercury 85W-90 Racing Gear Lube protects against Water Intrusion - advanced emulsifiers protect gears if water enters the gear housing. Wear - tackifiers and pressure additives improve oil film adhesion and protect against excessive wear. Horsepower loss - prevents horsepower loss and wont break down when gears reach high temps. Recommended for use in Mercury Racing o