Original BMW Valve Spring 20.1 mm for M20 BMW 325i, 325is, 325iX, and 525i (1987–1993)

Holding each valve shut against its seat between cam lobes, this Original BMW valve spring is the 20.1 mm diameter spring for the M20 inline six in the E30 325i, 325is, and 325iX and the E34 525i. The same spring is used on both the intake and exhaust valves, so one part number covers every valve position in the head. BMW gives a weight of 15 g per spring, and BMW production of this number dates to September 1985. It is made in Germany and sold individually. Valve springs are wear items, and weak springs let a valve close late or float at higher engine speeds.

Original BMW Parts carry a 24-month parts warranty.

The M20 cylinder head uses this one spring design throughout, which keeps ordering simple: count the valves you are servicing and order that quantity. The number to watch is engine type. Confirm your car has the M20 engine before ordering. If your car still carries its factory M20, this 20.1 mm spring is the correct replacement for intake and exhaust alike.

Technical Details

• Manufacturer: BMW (Genuine BMW)
• Part number: 11-34-1-706-584
• BMW name: Valve spring
• Diameter: 20.1 mm
• Weight: 15 g (0.53 oz)
• Application: intake and exhaust valves
• Engine: M20 inline six
• Production start: September 1985
• Made in Germany, sold individually
• Warranty: 24 months on Original BMW Parts

Common Questions

Do I need separate springs for the intake and exhaust valves?
No. This 20.1 mm spring is used on both intake and exhaust valves in the M20 head.

Is the spring sold as a set?
No, it is sold individually, so order one for each valve you are replacing.

Where is it made?
This genuine BMW spring is made in Germany.

Fitment & Compatibility

Confirm your model year and submodel against the table below before ordering. Send your VIN and PMB Performance will confirm the fit, drawing on more than 20 years in the trade.