Baldwin B301 Engine Oil Filter

Baldwin B301 Oil Filter for Subaru

The Baldwin B301 is an engine oil filter built for Subaru automotive applications that call for a compact spin-on design with an M20 x 1.5 thread. It replaces Subaru 15208-AA021 and is listed for multiple Subaru Legacy, Outback, Impreza, and Baja applications.

Key Features

• Part number: B301
• Engine oil filter for Subaru automotive applications
• M20 x 1.5 thread for proper fitment on listed Subaru engines
• 8 PSID by-pass valve
• Integral gasket included
• Outside diameter: 3 in. (76.2 mm)
• Height: 2 27/32 in. (72.2 mm)
• Replaces Subaru 15208-AA021

Detailed Description

Baldwin B301 is an engine oil filter specified for Subaru vehicles across several model years, including Subaru Legacy, Subaru Outback, Subaru Impreza, and Subaru Baja. The filter’s M20 x 1.5 thread, 3-inch outside diameter, and 2 27/32-inch height make it a direct-match style service part for the listed applications. The built-in 8 PSID by-pass valve and included integral gasket support routine oil service on Subaru engines that use this filter specification. If you are searching for a Baldwin B301 oil filter for Subaru Legacy or a Baldwin B301 oil filter for Subaru Outback and Impreza applications, this part matches the listed OE replacement reference.

Vehicle Fitment

• Fits 2003-2006 Subaru Baja, N/A
• Fits 2004-2006 Subaru Legacy, N/A
• Fits 2001-2002 Subaru Legacy, N/A
• Fits 2001-2006 Subaru Outback, N/A
• Fits 2004 Subaru Impreza, N/A
• Fits 2001-2002 Subaru Impreza, N/A
• Fits 2002-2003 Subaru Impreza, N/A
• Fits 2000 Subaru Impreza, N/A
• Fits 1993-2000 Subaru Impreza, N/A
• Fits 1990-2000 Subaru Legacy, N/A
• Fits 2000 Subaru Outback, N/A

What It Helps Address

• Routine engine oil filtration service on listed Subaru models
• Replacement for a worn or clogged oil filter
• Service intervals where the OE-style filter reference is Subaru 15208-AA021
• Oil system maintenance on Subaru Legacy, Outback, Impreza, and Baja applications

Installation Notes and Tips

Verify the thread size, gasket sealing surface, and filter dimensions before installation. Replace the filter during each oil service and confirm the old gasket is removed from the mounting surface. For Subaru Legacy, Outback, Impreza, and Baja applications, match the OE number and engine filter specification to the vehicle before installation.

Quality Assurance

Baldwin manufactures filtration products for automotive service applications, and this B301 oil filter is built to the listed dimensional and fitment specifications for Subaru vehicles.