The Mercury OEM Oil Injection Pump 815698T is a factory-style replacement pump used on many Mercury and Mariner V6 two-stroke outboards equipped with automatic oil injection.
 
Commonly searched as 815698T, 815698, and 41032, this pump is used on many 2.0 Liter, 2.4 Liter, and 2.5 Liter Mercury V6 engines.
 
This part is intended for owners who want to retain the original Mercury oil injection system instead of converting to premix. On compatible engines, the oil pump meters two-stroke oil into the fuel system so the operator does not have to mix oil with every tank of fuel manually.
 
Mercury and Mariner Fitment
 
The 815698T oil injection pump commonly fits select Mercury 135 HP, 150 HP, 175 HP, 200 HP, and 225 HP V6 two-stroke outboards, including many Black Max, XR2, XR4, XR6, XRi, EFI, carbureted V6, 200 HP, 225 Pro Max, and Pro Max-style 2.5L engines.
 
It is also associated with many Mercury Marine and Mariner 2.0L, 2.4L, and 2.5L V6 recreational and performance outboards used on bass boats, lake boats, flats boats, and older high-performance hulls.
 
Because Mercury used different oil injection layouts across serial-number ranges, always confirm fitment by engine serial number, original pump number, and factory parts diagram before ordering.
 
This pump is for compatible with carbureted and EFI Mercury V6 two-stroke oil injection systems. It is not for engines already converted to premix, Optimax DFI oiling systems, or Mercury FourStroke engines.
 
What the Oil Pump Does
 
On Mercury V6 two-strokes, the oil injection pump delivers two-stroke oil from the oil tank system into the engine’s fuel delivery path. The pump works with the linkage, drive components, oil hoses, warning system, and check valves to keep oil moving correctly.
 
When maintained properly, the system provides automatic lubrication while keeping the engine in its original Mercury factory configuration. This is a good option for stock engines, restorations, and recreational boats where convenience and OEM-style operation are important.
 
Signs of Oil Injection Problems
 
Oil injection problems should be taken seriously because loss of lubrication can quickly damage pistons, rings, bearings, and cylinder walls. Warning signs include oil alarms, visible oil leaks, cracked or brittle oil lines, poor oil usage, air bubbles in the oil hose, damaged linkage, loose fittings, or inconsistent oil movement.
 
Not every oiling problem is caused by the pump itself. A restricted hose, failing check valve, cracked tank cap, damaged remote tank hose, poor crankcase pressure signal, warning-module issue, or incorrect linkage adjustment can also cause lubrication concerns. The complete oil injection system should be inspected before replacing parts.
 
Installation and Service Notes
 
When replacing a Mercury 815698T / 815698 / 41032 oil injection pump, inspect the oil hoses, clamps, fittings, linkage arm, and check valves. Old two-stroke oil lines can harden over time and may crack when disturbed.
 
After installation, the system must be properly primed and bled according to Mercury service procedures. Never assume the pump is delivering oil simply because it has been installed. Verify oil movement, linkage operation, and warning-system function before running the engine under load.
 
Factory Oil Injection vs. Premix
 
Some Mercury V6 owners keep the factory oil injection system, while others convert to premix with an oil injection block-off kit. For stock 135 HP, 150 HP, 175 HP, and 200 HP Mercury V6 outboards, a properly maintained oil injection system can be convenient and reliable.
 
For older engines, high-RPM builds, race applications, or owners who want full control over oil ratio, premix may be preferred.
 
The 815698T oil pump is for restoring or maintaining the original Mercury oil injection system. If an engine has been converted to premix, the full oil injection system must be restored correctly before reinstalling the pump.
 
Part Number Cross References
 
This Mercury V6 oil injection pump is commonly searched under 815698T, 815698, and 41032. Related searches include Mercury oil pump, Mercury V6 oil injection pump, Mercury 2.5 oil pump, Mercury XR6 oil pump, Mercury XRi oil injection pump, and Mercury Pro Max oil pump.
 
Buckshot Racing #77 Tech Tip
 
Do not gamble with two-stroke lubrication. Any time an oil injection pump is replaced, verify oil flow, inspect the hoses, confirm linkage movement, bleed the system, and make sure the warning system works correctly.
 
For a Mercury 150 XR6, 175 XRi, 200 EFI, 200 carbureted V6, or 225 Pro Max, the oil pump is only one part of the lubrication system. A good pump cannot protect the engine if the hoses, check valves, tank system, or linkage are neglected.
 
Final Thoughts
 
The Mercury OEM 815698T Oil Injection Pump is an important replacement part for many Mercury and Mariner 2.0L, 2.4L, and 2.5L V6 two-stroke outboards. Whether you are keeping a classic Black Max, XR2, XR4, XR6, XRi, EFI, or 225 Pro Max in factory-style condition, proper oil injection maintenance is essential for long engine life.