The Subaru EJ engine is a series of four-stroke automotive engines manufactured by Subaru. They were introduced in 1989, intended to succeed the previous Subaru EA engine.

The 2.5-liter engine from EJ series appeared in 1995. EJ25 is the biggest engine among other EJ engines - EJ15, EJ16, EJ18, EJ20, and EJ22. The engine became widespread in all major models of the brand.

Aug 14, 2021 · The Subaru EJ25 is a 2.5 Liter engine manufactured by Subaru in Gunma Oizumi Plant and one of the members of the EJ series. It is the most widely used and largest engine among other EJ family members – EJ15, EJ16, EJ18, EJ20, and EJ22, having a …

Aug 30, 2022 · EJ25 engine blocks have cast-iron sleeves, SOHC/DOHC aluminum heads, and belt-driven camshafts. However, it’s worth pointing out that multiple versions of the EJ25 are available in both naturally aspirated and turbocharged configurations, just like their 2.5l H4 engine.

The Subaru EJ25 series of engines has proven the test of time, and has been in use since 1994 on Japanese models, all the way up to the final WRX STI models. This iconic engine has powered everything from naturally aspirated commuter cars, to sporty turbocharged models alike.

Mar 4, 2025 · The EJ25 engine has powered a diverse range of Subaru vehicles, each with its own set of strengths and characteristics. From the rugged Outback to the sporty WRX, these vehicles cater to various driving styles and preferences, making the EJ25 a significant part of Subaru’s legacy.

Nov 16, 2023 · The Subaru EJ25 engine is a 2.5-liter, flat-four boxer engine with variations in horsepower from 155 hp to 341 hp and torque from 140 lb-ft to 330 lb-ft. It features a cylinder bore of 99.5 mm and a piston stroke of 79 mm with different compression ratios for naturally aspirated and turbocharged models.

Aug 28, 2022 · Today, you will learn more about the Subaru 2.5i boxer engine (EJ25) that is considered to be durable and powerful but still problematic and with a lot of surprises. We are going to tell you about its main features, durability, and common problems, and also about our points of view on whether you should buy a vehicle powered by this engine or not.

Dec 31, 2016 · Subaru EJ25 engine specs, its main problems and reliability. What engine oil to use on EJ25 and its capacity, how to increase engine performance (Tuning guide)

Nov 1, 2022 · The EJ25 engine is the largest of the EJ engines, which include the EJ15, EJ16, EJ18, EJ20, and EJ22. The engine was a staple in all of the brand's key models during its run, and one of its key applications was in the 1996 to 2012 models of the Outback SUV.