SAE 75W-90 synthetic Lucas M8 Specifically created for maritime uses, maritime Gear Oil is a 100% synthetic, non-foaming, incredibly slick, long-lasting lubricant. M8 Marine Gear Oil, which was first created for high-performance offshore racing boats, contains seal conditioners and a special combination of synthetic chemicals that guard against rust and wear brought on by both freshwater and saltwater during prolonged storage. Excellent for use in any stern drives, v-drives, gear boxes, wheel bearings, and superchargers that are heavy duty or high performance.