S52 Engine

Specifications

The BMW S52 engine is a naturally aspirated inline-six designed primarily for the North American E36 M3 and Z3 M models, produced between 1995 and 2000. It features a 3.2-liter (3,152 cc) displacement with a cast-iron block and aluminum alloy cylinder head, utilizing a DOHC valvetrain with single VANOS (variable valve timing on the intake cam) and 24 valves. The engine has a bore and stroke of 86.4 mm × 89.6 mm, a compression ratio of 10.5:1, and produces around 240 hp at 6,000 rpm with 236 lb-ft of torque at 3,800 rpm, reaching a redline of approximately 6,500–7,000 rpm.

 It uses electronic fuel injection, runs on petrol, and has an oil capacity of roughly 5.5 L. The S52 was developed as a high-performance variant of the M52 for the North American market, combining reliability with a sporty, responsive character. 

Compatible Models

1996–1999 BMW E36 M3 (Coupe, Sedan, Convertible)

This was the primary application of the S52 engine in North America. The E36 M3 paired the 3.2L inline-six with either a 5-speed manual or automatic transmission. Compared to the European-spec E36 M3 (which used the higher-revving S50B32), the S52 version focused more on strong mid-range torque and daily drivability. It delivered 240 hp and 236 lb-ft of torque, offering smooth power delivery, solid reliability, and balanced chassis performance across all body styles.  

1998–2000 BMW Z3 M Roadster & M Coupe (E36/7 and E36/8)

The S52-powered Z3 M models shared the same engine output as the E36 M3 but were lighter and more compact, giving them a more aggressive and raw driving feel. The M Roadster offered open-top performance, while the M Coupe provided increased chassis rigidity and distinctive styling. These models are known for strong acceleration, sharp handling, and collectible status

BMW E36 3 Series (1992–1999): 325i/is, 328i/is, 323i

The S52 is a popular upgrade for non-M E36 models because it shares the same engine family (M50/M52 architecture). Installation is relatively straightforward (“plug-and-play” compared to other swaps), often requiring matching wiring harnesses, ECU tuning, and supporting components (cooling, exhaust, drivetrain). The swap significantly improves performance while maintaining OEM reliability and drivability.

Frequently Asked Questions