Oil Tank Reservoir Oildyne Style 1 Bolt Model For MerCruiser 18525A1, 854531-1

Oil Tank Reservoir for MerCruiser

This oil tank reservoir, Oildyne style 1 bolt model, is a replacement for MerCruiser sterndrive and inboard engines, with OEM cross-reference numbers 18525A1 and 854531-1.

Overview

This oil tank reservoir for MerCruiser is designed as a direct replacement for the Oildyne style 1 bolt model used on many MerCruiser applications. It stores engine oil and supplies it to the oil injection system or remote filter assembly. The reservoir fits MerCruiser models requiring OEM part numbers 18525A1 or 854531-1.

Built For Performance

• Constructed from durable polyethylene to resist impact and chemical exposure
• Features a threaded top cap with venting for pressure equalization
• Includes a dipstick or level indicator for easy oil level checks
• Single-bolt mounting flange simplifies installation
• Sealed connections prevent leaks and contamination

On-The-Job Use

• Commonly used on MerCruiser sterndrive and inboard engine installations
• Essential for maintaining proper oil supply to the engine during operation
• Replacement needed when the original reservoir cracks, leaks, or becomes brittle over time

Specs At A Glance

Good To Know

Q: Is this oil tank reservoir a direct replacement for the original MerCruiser part? A: Yes, it is designed to replace OEM part numbers 18525A1 and 854531-1 with the same mounting and connection specifications for most MerCruiser models.

Q: What type of oil should I use in this reservoir? A: Use only MerCruiser-approved 4-cycle marine engine oil or the oil recommended in your engine owner's manual to ensure proper lubrication.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.