Mercury Marine Mercruiser OEM 2-Stroke Outboard Motor Oil - 2 Gallon (92-8M0078011) | Premium Engine Lubricant for Boats & Marine Engines | Ideal for Fishing, Watersports & Recreational Boating

Definitely Mercury's FLAGSHIP oil (best they offer). Originally designed for Military use (to be able to clean up filthy jet fuel when it has to be used in outboards), also (previously) sold under the name "Rejuvenate". Stabilizes fuel in pre-mix process and really reduces carbon deposits. Allows for running at high RPM for long periods of time. I ran an oil tank full through my rebuilt '99 Merc 200 HP EFI the last 2 seasons and it made a difference.