Catalyst Marine Engine 5 Quart 25W-40 | Sierra 18-9400CAT-4
Catalyst Marine Engine 5 Quart 25W-40 | Sierra 18-9400CAT-4
Sierra
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Catalyst Marine Engine 5 Quart 25W-40 | Sierra 18-9400CAT-4
Catalyst Marine Engine 5 Quart 25W-40 | Sierra 18-9400CAT-4
Engineered specifically for 4-stroke marine engines equipped with catalyst emission systems, this premium 25W-40 blend delivers the advanced protection your vessel demands. Sierra's catalyst-compatible formula ensures optimal performance while safeguarding your engine's emission control components, keeping your boat running smoothly and reliably season after season.
- Sierra premium blend catalyst compatible inboard engine oil
- SAE 25W-40
- 5 quart jug
- Recommended for use with inboard and I/O marine engines with catalyst exhaust systems
- Meets the requirements of modern 4-stroke recreational engines with or without emission catalyst systems
- Developed specifically for the marine environment and the high running stresses marine engines encounter
- Protects internal engine components from rust, corrosion, and from sticking piston rings
- Premium blend features high detergency, anti-oxidants, and antiwear proprties
- ZDDP anti-wear additive prevents phosphorus depletion and extends the emission catalyst life
- Exceeds all 4-stroke requirements including FC-W and FC-W Cat compatible
- NMMA FC-W certified
- Replaces Bel-Ray 99730-BT4
! Compatibility references are provided for informational purposes only and do not constitute a fitment guarantee. Part numbers, application listings, and "replaces" cross-references are based on manufacturer data and are intended as a starting point for identification — not a guarantee of fit for your specific engine, hull, or installation.
Buyer is solely responsible for verifying compatibility with their engine model, serial number, model year, and trim configuration before purchase. If you are unsure whether this part fits your application, contact MacombMarineParts.com before you buy — we're available via text, email, or online chat to help verify compatibility for your specific application.
MacombMarineParts.com is not liable for parts ordered based on assumed fitment. Returns due to buyer-selected incorrect fitment are subject to our standard return and restocking fee policies.