Synthetic Blend Mercruiser Sterndrive Engine Oil - 5 Qt - (MW)

Sierra 25W-40 4-Stroke Synthetic Marine Oil

Sierra 4-Stroke 25W-40 Engine Oil is blended with premium grade synthetic and mineral based stock combined with superior designed additives formulated for the stress endured by sterndrive and inboard engines. This oil was developed for the marine environment and will outperform standard 4-cycle automotive engine oils. Sierra's 25W-40 oil offers excellent detergency, anti-oxidants, anti-wear, and corrosion protection. This oil provides numerous benefits for your boat engine including reduced wear of internal components, cleaner pistons, and it helps prevent ring sticking. Sierra 25W-40 oil also provides excellent low temperature operating properties.

Features:

• 4-Stroke oil
• Superior corrosion protection
• Advanced lubrication for reduction of wear to internal engine components
• Outstanding friction reduction and wear protection
• Removes thermal breakdown under high RPM's, extreme temperatures and loads
• Extensively tested for outstanding performance
• Exceeds stringent Sierra and OEM warranty requirements
• NMMA FC-W Certified/API-SL

Interchangeable with:

• Mallory
• 9-82392
• Mercury Marine
• 92-883725K01

How much oil does my engine need?

It varies model to model, check out our Engine Oil Capacity Guide for more information and capacity charts!

 Click to Download Sierra Synthetic Oil MSDS

Frequently Asked Questions

What is Sierra 25W-40 4-Stroke Synthetic Marine Oil used for?

Sierra 25W-40 4-Stroke Synthetic Marine Oil is formulated for sterndrive and inboard marine engines. Its synthetic and mineral-based formulation is designed for marine operating conditions and provides lubrication, wear protection, corrosion protection, and detergency for 4-stroke engines.

How does Sierra 25W-40 Marine Oil protect engine components?

Sierra 25W-40 Marine Oil provides anti-wear and corrosion protection while reducing friction and wear on internal engine components. Its detergency helps keep pistons cleaner and helps prevent ring sticking during engine operation.

Can Sierra 25W-40 Marine Oil handle high RPM, temperatures, and engine loads?

Yes. Sierra 25W-40 Marine Oil is formulated for the stresses encountered by sterndrive and inboard engines. It is designed to resist thermal breakdown under high RPM, extreme temperatures, and heavy loads.

Does Sierra 25W-40 Marine Oil meet NMMA FC-W and API-SL requirements?

Yes. Sierra 25W-40 4-Stroke Synthetic Marine Oil is NMMA FC-W Certified and carries an API-SL rating. The product description also states that it exceeds stringent Sierra and OEM warranty requirements.

What marine oils does Sierra 25W-40 4-Stroke Oil interchange with?

Sierra 25W-40 4-Stroke Synthetic Marine Oil is listed as interchangeable with Mallory 9-82392 and Mercury Marine 92-883725K01. Verify the oil requirements for your specific engine before use.

Does Sierra 25W-40 Marine Oil provide low-temperature operating performance?

Yes. The product description states that Sierra 25W-40 Marine Oil provides excellent low-temperature operating properties in addition to its lubrication, wear protection, and corrosion protection characteristics.

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