92858037K01 Mercury MerCruiser Oil 3.78L Optimax | Genuine Quicksilver OEM Part

🔧 Product Description

Genuine Mercury OptiMax / DFI 2-Stroke Outboard Oil 3.78L - Part Number: 92-858037K01

Genuine Mercury OptiMax / DFI 2-cycle outboard oil in a 3.78 litre container. This synthetic-blend oil is formulated for Mercury and Mariner OptiMax and direct fuel injected two-stroke outboards, providing lubrication, carbon control and piston scuff protection in high-pressure DFI operating conditions.

⚙️ Key Features

• Genuine Mercury / Quicksilver OptiMax DFI oil

• Correct Mercury part number 92-858037K01

• 3.78 litre / 1 US gallon container

• Synthetic-blend 2-cycle oil

• Formulated for OptiMax and DFI two-stroke outboards

• Helps minimise carbon build-up and protect against piston scuffing

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 92-858037K01 current 3.78L OptiMax / DFI oil reference

• 92-858037Q01 earlier / related 3.78L packaged reference where applicable

OEM / Related Numbers:

• 92-858037K01

• 858037K01

• 92858037K01

• 92-858037Q01

• OptiMax / DFI 2-cycle outboard oil

• Mercury DFI oil 3.78L

• Mercury OptiMax oil 1 gallon

• 92-858038K01 related 9.46L container

Aftermarket / Verified Equivalents:

• Sierra TC-W3 direct-injection synthetic-blend equivalents are available where an approved direct-injection 2-stroke oil is acceptable

• Use Mercury OptiMax / DFI oil where Mercury specifies it for warranty and service protection

🚤 Compatibility

Commonly used on:

• Mercury OptiMax two-stroke outboards

• Mercury DFI two-stroke outboards

• Mariner OptiMax / DFI two-stroke outboards

• Direct-injected two-cycle outboards requiring OptiMax / DFI oil

Typically suits:

• Engine models:

• Mercury 75 DFI / OptiMax applications where OptiMax / DFI oil is specified

• Mercury 90 DFI / OptiMax applications where specified

• Mercury 115 DFI / OptiMax applications where specified

• Mercury 125 DFI / OptiMax applications where specified

• Mercury 135 DFI / OptiMax applications where specified

• Mercury 150 DFI / OptiMax applications where specified

• Mercury 175 DFI / OptiMax applications where specified

• Mercury 200 DFI / OptiMax applications where specified

• Mercury 225 DFI / OptiMax applications where specified

• Mercury 250 DFI / OptiMax applications where specified

• Mercury 300 DFI / OptiMax applications where specified

• Mercury 200XS / 225XS / 250XS / 300XS direct-injection performance applications where OptiMax / DFI oil is specified

• Mariner DFI / OptiMax two-stroke outboards where OptiMax / DFI oil is specified

• HP Range: commonly 75HP - 300HP DFI / OptiMax where specified

• Engine Type: Mercury / Mariner DFI and OptiMax two-stroke outboard

• System Type: Two-stroke oil injection / DFI lubrication

• Container Size: 3.78L

🔌 Function

The oil lubricates internal two-stroke engine components while supporting direct-injection combustion requirements. It helps reduce piston scuffing, protect against wear and minimise carbon deposits in OptiMax / DFI engines.

Common service use:

• Routine oil top-up for remote or engine-mounted oil tanks

• Oil system refill after service

• OptiMax / DFI engine maintenance

• Replacement when incorrect oil has been used

• Recommended where Mercury specifies OptiMax / DFI oil

📦 Condition

• Genuine Mercury / Quicksilver oil

• Brand new

• Supplied in sealed 3.78L container