Mercury – Oil Tank Assembly | Two-Stroke OptiMax Lubrication | 833069T6

Overview

This oil tank assembly is a solid fix for an older OptiMax that’s starting to show its age. When the original tank gets brittle or the grommets crack, the engine can act a little unpredictable, so swapping the tank is an easy way to bring things back to normal. The parts in this kit line up the way they should, and the hardware makes the job pretty straightforward. It’s one of those replacements that gives you some peace of mind every time you turn the key.

Key Features

 • Complete Assembly – Comes with the tank, grommets, bushing plates, decal, T-fitting, and cable ties.
 • OEM Build Quality – Holds up to the heat, vibration, and everyday movement of a two-stroke OptiMax.
 • Fresh Sealing Components – New grommets help tighten up the system and keep air out of the oil line.
 • Extreme-Temperature Tested – Stays stable from cool morning starts to hot compartment temps.
 • Marine-Ready Materials – Designed to last in real boating environments.

Engine & Boat Compatibility

 • Mercury 135–150 horsepower Two-Stroke OptiMax
 • Serial range 0G760300–0G960499
 • OptiMax direct-injection oiling system
 • OEM tank mounting layout

Performance & Practical Benefits

With a fresh tank in place, the engine usually settles into a smoother idle and stops giving those little hiccups you get from air sneaking into the oil line. Throttle response often feels steadier, especially when you’re warming the engine up. It’s a simple part, but it does a lot to keep an older OptiMax feeling dependable. Over time, it helps cut down on warning beeps and avoids the headaches that come from inconsistent oil delivery.

Why Buy OEM

An OEM tank fits the way the engine expects it to—no odd angles, no stretching hoses, and no guessing on whether the seals will hold. The materials are built for the heat and vibration these motors throw at them, so you’re not swapping it again anytime soon. It just works the way the system was designed to.

FAQ

Q1: What signs tell me the tank is wearing out?
Leaks around the grommets, weird oil levels, or random alarms usually point to a tired tank.

Q2: Do I need to calibrate anything after installing it?
No, just install it, prime the system, and you’re set.

Q3: How well does this tank hold up in saltwater?
It’s built for marine use—just keep up with normal rinsing and maintenance.

Q4: Anything helpful to check before installing the new tank?
Take a quick photo of your hose routing so everything lands where it belongs later.

Q5: What happens when the old tank starts failing?
You might get aerated oil, uneven running, or alarms that come and go—classic signs of a leak or bad seal.

• Supersessions
  1200-8M0063190, 1200-8M0063190, 833069T9