{"product_id":"pcv-oil-separator-diaphragm-mercedes-m278-v8-4-0l-4-6l-m157-oem-2780100431","title":"PCV Oil Separator Diaphragm – Mercedes M278 V8 4.0L 4.6L M157 | OEM 2780100431","description":"\u003ch2\u003eOil Consumption on Your Mercedes M278 V8? Replace the Separator Diaphragm for $14.\u003c\/h2\u003e\n\u003cp\u003eThe PCV oil separator diaphragm on Mercedes M278 (4.0L, 4.6L V8) and M157 (5.5L, 6.0L V8) engines degrades and causes oil blow-by into the intake, elevated oil consumption, and blue exhaust smoke. OEM P\/N 2780100431 is the correct diaphragm membrane for rebuilding the separator instead of replacing the full assembly.\u003c\/p\u003e\n\u003cdiv style=\"background-color:#fff9e6;border-left:4px solid #ffcc00;padding:15px;margin:20px 0;\"\u003e\n  \u003cstrong\u003e✓ What You Get:\u003c\/strong\u003e PCV oil separator diaphragm for Mercedes M278 V8 (4.0L\/4.6L) and M157 V8 (5.5L\/6.0L) — stops oil blow-by and reduces oil consumption.\n\u003c\/div\u003e\n\u003chr style=\"border:0;border-top:1px solid #eee;margin:20px 0;\"\u003e\n\u003ch2\u003eWhat's Included\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e1× PCV oil separator diaphragm membrane (OEM 2780100431)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhy Replace?\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStops Oil Blow-By:\u003c\/strong\u003e Failed membrane allows oil mist into the intake system and intercooler.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReduces Oil Consumption:\u003c\/strong\u003e Properly sealed PCV circuit keeps oil in the crankcase.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEliminates Blue Smoke:\u003c\/strong\u003e Stops oil burn from ingested crankcase vapors.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSaves $200+ vs Assembly:\u003c\/strong\u003e OEM separator assembly costs $230+; this membrane alone rebuilds it for $14.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eVehicle Compatibility\u003c\/h2\u003e\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;margin-top:15px;font-family:sans-serif;\"\u003e\n    \u003cthead\u003e\n      \u003ctr style=\"background-color:#f8f9fa;border-bottom:2px solid #dee2e6;text-align:left;\"\u003e\n        \u003cth style=\"padding:12px;border:1px solid #dee2e6;\"\u003eMake\u003c\/th\u003e\n        \u003cth style=\"padding:12px;border:1px solid #dee2e6;\"\u003eModel\u003c\/th\u003e\n        \u003cth style=\"padding:12px;border:1px solid #dee2e6;\"\u003eEngine\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd style=\"padding:12px;border:1px solid #dee2e6;\"\u003eMercedes-Benz\u003c\/td\u003e\n\u003ctd style=\"padding:12px;border:1px solid #dee2e6;\"\u003eS-Class, CL, SL, GL, GLS\u003c\/td\u003e\n\u003ctd style=\"padding:12px;border:1px solid #dee2e6;\"\u003eM278 4.0L \/ 4.6L V8\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd style=\"padding:12px;border:1px solid #dee2e6;\"\u003eMercedes-Benz \/ AMG\u003c\/td\u003e\n\u003ctd style=\"padding:12px;border:1px solid #dee2e6;\"\u003eS63, CL63, SL63, ML63\u003c\/td\u003e\n\u003ctd style=\"padding:12px;border:1px solid #dee2e6;\"\u003eM157 5.5L \/ 6.0L V8\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2\u003eAbout This Part\u003c\/h2\u003e\n\u003cp\u003eMercedes M278 and M157 PCV oil separator diaphragm (OEM 2780100431) is the primary wear component inside the crankcase ventilation separator on these large V8 engines. Membrane failure is a frequent cause of oil consumption complaints and blue exhaust smoke on S-Class, CL, SL, GL, and AMG models with M278 or M157 powertrains.\u003c\/p\u003e\n\u003cdiv style=\"background-color:#f0f7ff;border-left:4px solid #3399ff;padding:15px;margin:20px 0;\"\u003e\n  \u003cstrong\u003e⚠ Verify Part Number Before Ordering:\u003c\/strong\u003e Confirm OEM 2780100431 matches your separator assembly before purchasing.\n\u003c\/div\u003e","brand":"Klifex","offers":[{"title":"Default Title","offer_id":53670278562106,"sku":"KL2780100431","price":14.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0944\/7207\/7626\/files\/7479674552_membrana-maslootdelitelya-mercedes.jpg?v=1782918235","url":"https:\/\/klifex.net\/es\/products\/pcv-oil-separator-diaphragm-mercedes-m278-v8-4-0l-4-6l-m157-oem-2780100431","provider":"Klifex – Automotive Repair Kits","version":"1.0","type":"link"}