Sierra 25W-40 4-Stroke Catalyst Marine Oil

Sierra 25W-40 4-Stroke Catalyst Marine Oil

This Sierra Premium Blend Engine Oil meets modern recreational 4-stroke engines with or without emission catalyst systems. Sierra 25W-40 is approved for all 4-stroke applications including outboard, sterndrive, and inboard.

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!

Frequently Asked Questions

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

Sierra 25W-40 4-Stroke Catalyst Marine Oil is a premium blend engine oil approved for 4-stroke outboard, sterndrive, and inboard applications. It is formulated for modern recreational marine engines with or without emission catalyst systems and provides lubrication, wear protection, and corrosion protection.

Is Sierra 25W-40 Catalyst Marine Oil compatible with emission catalyst systems?

Yes. Sierra 25W-40 is formulated for modern recreational 4-stroke engines with or without emission catalyst systems. Its formulation helps prevent phosphorus depletion and is designed to extend emission catalyst life.

What protection does Sierra 25W-40 4-Stroke Marine Oil provide?

Sierra 25W-40 provides corrosion and wear protection through advanced lubrication and ZDDP anti-wear additive technology. It also offers detergency and antioxidant properties and is formulated to support extended engine life in the marine environment.

Does Sierra 25W-40 Marine Oil meet FC-W requirements?

Yes. Sierra 25W-40 4-Stroke Catalyst Marine Oil is NMMA FC-W Certified and is formulated to exceed 4-stroke requirements, including FC-W and FC-W Catalyst Compatible requirements.

Can Sierra 25W-40 Marine Oil be used in outboard, sterndrive, and inboard engines?

Yes. The product description states that Sierra 25W-40 is approved for all 4-stroke applications, including outboard, sterndrive, and inboard engines. Verify the oil requirements for your specific engine before use.

What marine oil is Sierra 25W-40 4-Stroke Catalyst Marine Oil interchangeable with?

Sierra 25W-40 4-Stroke Catalyst Marine Oil is listed as interchangeable with Mercury Marine part number 92-8M0078627. Verify the required oil specification for your specific application before use.