Sierra 18-7999 Air Filter - Replaces 35-896247 - Mercury Marine 135/150/175 4-Stroke Verado (S/N 1B227000 & Up)

The Sierra 18-7999 Air Filter is a replacement air filter engineered for Mercury Marine 135, 150, and 175 horsepower 4-Stroke Verado outboards with serial number 1B227000 and up. It is built to restore proper airflow to the engine's induction system, helping maintain combustion efficiency and protect internal components from airborne debris and particulates during operation. This filter is designed as a direct replacement for the OEM Mercury Marine 35-896247 filter, allowing a straightforward swap without modification.

The filter fits Mercury's L-4 Verado outboard configuration and measures 10.39 inches long by 8.86 inches wide by 1.73 inches high, matching the housing dimensions of the applications it serves. At 0.3 pounds, it is a lightweight service part intended for routine maintenance intervals alongside other engine air intake components. Sierra backs the 18-7999 with a 90 day manufacturer warranty, giving buyers confidence in fit and function for this specific Verado application.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-7999
• Product Type: Air Filter
• Replaces (OEM): 35-896247
• Engine Configuration: L-4 Verado outboard
• Length: 10.39 inches
• Width: 8.86 inches
• Height: 1.73 inches
• Weight: 0.3 pounds
• UPC: 808282200121
• Warranty: 90 days

Fitment

• Mercury Marine 135/150/175 4-Stroke Verado (S/N 1B227000 & Up)
• L-4 Verado outboard

Replaces (OEM)

• 35-896247

Frequently Asked Questions

What engines does the Sierra 18-7999 air filter fit? The Sierra 18-7999 fits Mercury Marine 135, 150, and 175 horsepower 4-Stroke Verado outboards with serial number 1B227000 and up, in the L-4 Verado configuration.

What OEM part number does the 18-7999 replace? It replaces Mercury Marine OEM part number 35-896247, so it can be installed as a direct swap on applicable Verado outboards.

What are the dimensions of this air filter? The 18-7999 measures 10.39 inches long by 8.86 inches wide by 1.73 inches high.

How much does the 18-7999 air filter weigh? It weighs 0.3 pounds.

Is the Sierra 18-7999 a genuine Sierra part or a generic aftermarket copy? This is a genuine Sierra branded replacement part, part number 18-7999, manufactured to serve as a direct equivalent for Mercury Marine 35-896247.

Does this filter come with a warranty? Yes, the 18-7999 is covered by a 90 day manufacturer warranty.

Can I use the 18-7999 on a Verado outboard below 135 horsepower? No, the stated fitment for the 18-7999 covers 135, 150, and 175 horsepower 4-Stroke Verado models with serial number 1B227000 and up; lower horsepower Verado outboards are not listed in its fitment.

What does serial number 1B227000 and up mean for this filter's fitment? It indicates the 18-7999 is intended for Mercury Marine 135/150/175 4-Stroke Verado outboards built from serial number 1B227000 onward; engines with earlier serial numbers may require a different filter.

What is included when I order the 18-7999? Each order includes one Sierra 18-7999 air filter.

Is the 18-7999 an inline-4 or V-configuration filter? The 18-7999 is designed for the L-4 (inline-4 cylinder) Verado outboard configuration.

How does the 18-7999 differ from the Sierra 18-7997 air filter? The 18-7999 is built for 135/150/175 4-Stroke Verado outboards and replaces 35-896247, while the 18-7997 is a separate part number for different DFI outboard applications; the two are not interchangeable.