B58 intake valve stem seal VSI-BM50-I for BMW M340i M440i X3 M40i GR Supra A90

Precision 5 mm intake valve stem seal for B58 engines - engineered for fit, function and longevity on BMW and Toyota GR Supra applications.

• Reduces oil consumption and intake port oiling on stock, fast road or track day B58 builds.
• Ideal for cylinder head refreshes, cam swaps, upgraded valve springs or proactive replacement before symptoms appear.
• Fits all B58-powered models listed: BMW M140i to X7 40i, Z4 M40i and Toyota GR Supra A90 A91.
• No OEM-replacement framing - this is a performance-grade component built for real-world use.