Sierra Catalyst Oil 25W40, 1 Quart (946 mL), Mercury 92-8M0078627 Equivalent - 18-9400CAT-2

Sierra Catalyst Oil 25W40 is a 4-stroke marine engine oil formulated for use in engines equipped with catalytic converters, part number 18-9400CAT-2. It is supplied in a 1 quart (946 mL) bottle and is intended for water scooter and marine 4-stroke engine applications. The 25W40 viscosity is designed to provide consistent lubrication protection across a range of operating temperatures typical of marine use.

This oil cross-references directly to Mercury part number 92-8M0078627, making it a straightforward match for engines and service intervals that call for that Mercury-numbered catalyst oil. Each bottle is packaged individually, with the product also available from Sierra in larger case and pallet quantities for shops and high-volume users.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-9400CAT-2
• Viscosity: 25W40
• Volume: 1 Quart (946 mL / 32 Fluid Ounces)
• Container Type: Bottle
• Vehicle Service Type: Water Scooter
• Product Category: 4 Stroke Oil
• Unit Count: 1
• Weight: 2.02 pounds
• UPC: 808282325909

Fitment

Formulated for 4-stroke marine engines that specify catalyst-safe oil, including engines calling for Mercury oil number 92-8M0078627.

Replaces (OEM)

• 92-8M0078627 (Mercury)

Frequently Asked Questions

What viscosity is Sierra part 18-9400CAT-2? 18-9400CAT-2 is a 25W40 viscosity catalyst engine oil, packaged in a 1 quart (946 mL) bottle.

Does this oil cross-reference to a Mercury part number? Yes, Sierra 18-9400CAT-2 cross-references to Mercury part number 92-8M0078627.

How much oil is in one bottle? Each bottle of Sierra 18-9400CAT-2 holds 1 quart, equal to 946 mL or 32 fluid ounces.

What type of engine is this oil designed for? This is a 4-stroke marine engine oil intended for engines equipped with catalytic converters, such as those found in water scooters.

How much does one quart of Sierra 18-9400CAT-2 weigh? A single quart bottle of Sierra Catalyst Oil 25W40 (18-9400CAT-2) weighs 2.02 pounds.

Is 18-9400CAT-2 sold in larger sizes? The 18-9400CAT-2 quart size is part of a broader Sierra catalyst oil lineup that includes larger container options from the same product family.

What is the UPC for this product? The UPC for Sierra Catalyst Oil 25W40, part 18-9400CAT-2, is 808282325909.

Is this oil safe to use in engines with catalytic converters? Yes, Sierra 18-9400CAT-2 is formulated specifically as a catalyst oil for 4-stroke engines that require catalyst-safe lubrication.

Can I use 18-9400CAT-2 in place of Mercury 92-8M0078627? Sierra 18-9400CAT-2 is the direct cross-reference equivalent to Mercury 92-8M0078627, so it can be used where that Mercury oil is specified.

What container does the oil come in? Sierra 18-9400CAT-2 is packaged in a bottle containing 1 quart (946 mL) of 25W40 catalyst oil.