Pronto PO4612-SB4 Engine Oil Filter

OE-Style Oil Filtration for Subaru Engines

The Pronto OE Style engine oil filter is built for Subaru applications that call for a spin-on filter with OE-style dimensions and flow control. Part number PO4612-SB4 is a direct-fit service part for select Subaru WRX STI, WRX, Impreza, Forester, Outback, and Legacy models.

With an anti-drain back valve and bypass relief valve, this oil filter helps maintain oil supply at startup and supports proper filtration when oil flow conditions change. The closed-bottom spin-on design and M20x1.5p internal thread size match the listed Subaru applications.

Key Features

• OE Style replacement oil filter for Subaru engine service
• Spin-on filter design for straightforward routine maintenance
• Anti-drain back valve helps retain oil in the filter after shutdown
• Bypass relief valve supports oil flow if the filter media becomes restricted
• Height: 3.15 in.
• Outside diameter top: 2.57 in.
• Inside thread size: M20x1.5p
• Closed outer diameter bottom

Detailed Description

Pronto PO4612-SB4 is an OE-style engine oil filter engineered for Subaru engines that use a spin-on filter with M20x1.5p threads. It is listed for 2013-2021 Subaru WRX STI, 2012-2016 Subaru WRX, 2006-2014 Subaru Impreza, 2006-2013 Subaru Forester, 2007-2008 Subaru Outback, and 2007 Subaru Legacy. This makes it a practical service part for drivers searching for a Subaru WRX oil filter, Subaru Impreza oil filter, or Subaru Forester oil filter with OE-style fitment.

The anti-drain back valve helps keep oil in the filter after the engine is shut off, while the bypass relief valve provides an alternate flow path if the filter element becomes restricted. Those features support consistent oil delivery during cold starts and normal service intervals. Part number PO4612-SB4 also cross-references 15208AA100 for the same application.

What It Helps Address

• Oil drain-back after engine shutdown
• Restricted oil flow during cold starts
• Routine oil filtration service on Subaru engines
• Fitment issues from using the wrong thread size or filter height
• OE-style replacement needs for Subaru WRX STI, WRX, Impreza, Forester, Outback, and Legacy

Installation Notes and Tips

Verify the filter thread size, sealing surface, and clearance before installation. Replace the filter during scheduled oil service, pre-lubricate the gasket if recommended by your service procedure, and tighten to the vehicle manufacturer’s specified method. Confirm the application against the listed Subaru model and year before ordering PO4612-SB4.

Quality Assurance

Pronto OE Style parts are positioned as OE-style service replacements for maintenance applications. This oil filter is specified with an anti-drain back valve, bypass relief valve, and the listed Subaru fitment details to support accurate parts selection.