Original BMW Crankcase Vent Hose for BMW E30 318i and 318is M42 (1991–1992)

This Original BMW vent hose routes crankcase gases through the crankcase ventilation system on M42-powered E30 318i and 318is models. BMW names the part simply "Vent hose" and assigns it to the engine's crankcase venting group. It weighs 80 g (about 0.2 lb), and BMW shows production of this number starting in September 1989. The hose is made in Germany and is sold individually as a single piece. Every running engine leaks some combustion gas past the piston rings. A vent hose gives that blow-by a path back to the intake so it does not build pressure inside the crankcase.

Original BMW Parts carry a 24-month parts warranty.

The E30 was built with several four-cylinder engines, and BMW assigns this hose only to the M42. BMW's application data covers the 318i sedan, the 318i Cabrio, and the 318is, all with the M42. The hose works in constant oil vapor, heat, and crankcase pressure. Over time oil breaks down rubber and plastic, connectors become brittle and can snap during removal, and the hose body can split. A leak in this hose lets unmetered air into the intake.

Technical Details

• Manufacturer: BMW (Original BMW part)
• Part number: 11-15-1-717-858
• BMW part name: Vent hose
• System: crankcase ventilation
• Weight: 80 g (0.2 lb)
• Production start: September 1989
• Country of manufacture: Germany
• Sold as: one piece
• Warranty: 24 months on Original BMW Parts

Common Questions

How can I tell this hose has failed?
Look for cracks, splits, or a broken connector.

Does it fit the 318i Convertible?
Yes. BMW applies this hose to the E30 318i Cabrio with the M42 engine as well as to the sedan and the 318is.

Fitment & Compatibility

Use the fitment table below to confirm year, make, model, submodel, and any notes tied to your exact vehicle. Pay close attention to engine, chassis, position, and option-specific details before ordering. Send your VIN and PMB Performance will confirm the fit, drawing on more than 20 years in the trade.