{"product_id":"elring-403-730-engine-valve-stem-oil-seal","title":"Elring 403.730 Engine Valve Stem Oil Seal - Intake","description":"\u003ch2\u003eElring 403.730 Valve Stem Oil Seal\u003c\/h2\u003e\u003cp\u003eElring 403.730 is an engine valve stem oil seal made from FPM (fluoride rubber) for reliable sealing in high-temperature valve train environments. With an 8.8 mm inside diameter, 12.2 mm outside diameter, and 9.7 mm thickness, it is specified for 6 mm valve stem diameter applications and is listed for intake positions on many Mercedes-Benz, BMW, Ferrari, and other European and import engines.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFPM (fluoride rubber) construction for heat and oil resistance\u003c\/li\u003e\n\u003cli\u003e8.8 mm inside diameter, 12.2 mm outside diameter, 9.7 mm thickness\u003c\/li\u003e\n\u003cli\u003eDesigned for 6 mm valve stem diameter applications\u003c\/li\u003e\n\u003cli\u003eGreen seal design for easy identification during engine service\u003c\/li\u003e\n\u003cli\u003eOE-style sealing solution for intake valve stem service\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Product Overview\u003c\/h2\u003e\u003cp\u003eThis Elring valve stem oil seal is used to control oil flow at the valve guide and stem interface, helping maintain proper combustion chamber sealing and valve train cleanliness. It is a direct-fit service part for a wide range of applications, including Mercedes-Benz C300 intake, Mercedes-Benz E350 intake, BMW X3, and Ferrari F8 Tributo engine service. This part cross-references MAHLE (e.g., SS45618, SS45940) for the same application. Part number 403.730 is also commonly searched as Elring 403730.\u003c\/p\u003e\u003ch2\u003eWhat This Part Helps Address\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eOil entering the combustion chamber through worn valve stem seals\u003c\/li\u003e\n\u003cli\u003eBlue exhaust smoke after startup or deceleration\u003c\/li\u003e\n\u003cli\u003eOil consumption caused by valve guide sealing wear\u003c\/li\u003e\n\u003cli\u003eFouled spark plugs from excess oil in the intake side\u003c\/li\u003e\n\u003cli\u003eValve train contamination during engine rebuild or cylinder head service\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eVerify valve stem diameter, seal dimensions, and intake\/exhaust position before installation. Clean the valve guide area thoroughly and inspect the valve stem and guide for wear or scoring before fitting the new seal. For engines with confirmed intake-side listings, install only in the specified position and follow the service procedure for the cylinder head being repaired. Confirm fitment by year, make, model, and engine configuration before ordering.\u003c\/p\u003e\u003ch2\u003eQuality Assurance\u003c\/h2\u003e\u003cp\u003eElring is a recognized name in engine sealing systems, and this seal is built to the dimensional and material specifications listed for the application. Use the confirmed vehicle fitment data to match the correct seal for Mercedes-Benz, BMW, Ferrari, and other listed engines. Part number 403.730 is specified for broad import and European engine coverage across 2002-2024 model years.\u003c\/p\u003e","brand":"Elring","offers":[{"title":"Default Title","offer_id":43411025461429,"sku":"DTWD-403.730","price":11.28,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/EL_403730_Fro_a05ed61c-cd28-4124-ab05-b711f44676c4.jpg?v=1774730503","url":"https:\/\/www.partcatalog.com\/products\/elring-403-730-engine-valve-stem-oil-seal","provider":"PartCatalog","version":"1.0","type":"link"}