sevencow Oil Reservoir Cap Assembly for Mercury V6 105-240HP EFI Pro Max — Replacement kit with harness & gasket

sevencow Oil Reservoir Cap Assembly is a complete replacement oil cap kit designed to restore warning functionality and seal integrity on compatible Mercury/Mariner V6 outboards from 105 to 240 HP.

This replacement assembly fits a broad range of Mercury and Mariner outboards (1983–2007) and swaps in for worn or damaged oil reservoir caps and sensors. The kit includes the cap, float, push nut, gasket and wiring harness so you regain the oil-level warning circuit and a proper tank seal without modifying the engine. It replaces part numbers 43300A1, 43300A5, 43300A6, 36-43300A9 and 99024A4 and is sized for EFI PRO MAX, M2, Blackmax, Sport and several Jet boat models including XR2, XR4 and XR6.

How will this cap assembly restore oil-warning function?

Installing this kit replaces the internal float and wiring that signal the oil-warning module. That allows the engine electronics to detect low oil condition or circuit faults the same way the original cap did.

• Includes blue and black leads for reconnecting to oil warning module and ground.
• Pre-assembled float and harness for plug-and-play replacement.
• Gasket ensures proper sealing to prevent leaks and false alarms.

Which engines and part numbers does it fit?

The assembly is designed for Mercury/Mariner outboards from 105 through 240 HP made across many model years. Check existing part numbers and engine compatibility before ordering.

• Compatible HP: 105, 135, 140, 150, 175, 200, 210, 225, 240.
• Fits EFI PRO MAX, M2, Blackmax, Sport and Jet Boat XR2/XR4/XR6 V‑6 models.
• Replaces OEM 43300A1, 43300A5, 43300A6, 36-43300A9, 99024A4.

How difficult is installation and what tools are needed?

Installation is straightforward for anyone comfortable with basic boat maintenance. The electrical connections are color-coded and the kit supplies the gasket and push nut to secure the assembly in the oil tank opening.

• Connect black lead to engine ground and blue lead to the oil warning module.
• Tighten cap to the oil tank and confirm gasket seats correctly to avoid leaks.
• Typical tools: screwdriver or small wrench; no special calibration required.

What should I check after fitting the new cap?

After installation, verify the oil-warning light and circuit behave correctly and inspect for any oil seepage around the cap area. A short test run and visual check will confirm correct seating and electrical connection.

• Start the engine briefly and confirm no persistent warning lights.
• Inspect around the gasket for leaks while engine is off and warm.
• Ensure wiring is routed away from moving parts and heat sources.

Who is this for: This sevencow replacement oil reservoir cap assembly is aimed at boat owners, mariners and mechanics who need a direct-fit replacement for aging or damaged oil caps on Mercury/Mariner V6 outboards (105–240 HP). It's especially useful when the original cap no longer seals or the oil-level warning circuit fails. If you maintain older EFI PRO MAX, M2, Blackmax, Sport or Jet boat engines and want a full cap-and-sensor kit that restores function without ECU changes, this assembly provides the necessary hardware for a clean, reliable swap. sevencow offers a 30-day refund for dissatisfied customers, and the kit ships ready to install for routine field service or DIY maintenance.