{"product_id":"pcv-oil-separator-repair-kit-mercedes-m278-v8-4-0l-4-6l-m157-oem-2780100431","title":"PCV Oil Separator Repair Kit – Mercedes M278 V8 4.0L 4.6L M157 | OEM 2780100431","description":"\u003ch2\u003eOil Consumption on Your Mercedes M278 V8? Rebuild the PCV Separator for $26.\u003c\/h2\u003e\n\u003cp\u003eThe PCV oil separator on Mercedes M278 (4.0L, 4.6L V8) and M157 (5.5L, 6.0L V8) engines is a known failure point. When the separator fails, oil blow-by enters the intake system, causing oil consumption, blue smoke, and intake oiling. This complete repair kit (OEM ref. 2780100431) includes the diaphragm and all seals needed for a full separator rebuild.\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 Complete PCV oil separator repair kit — diaphragm membrane + all seals — for Mercedes M278 V8 (4.0L\/4.6L) and M157 V8 (5.5L\/6.0L).\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\u003ePCV oil separator diaphragm membrane (OEM 2780100431)\u003c\/li\u003e\n  \u003cli\u003eHousing O-rings and seals (complete set)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhy Rebuild Instead of Replace?\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStops Oil Blow-By:\u003c\/strong\u003e Worn diaphragm allows oil mist to bypass the separator and enter the intake.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReduces Oil Consumption:\u003c\/strong\u003e Restores proper crankcase ventilation — oil stays in the crankcase.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClears Blue Smoke:\u003c\/strong\u003e Eliminates exhaust smoke caused by ingested oil vapor.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSaves $200+ vs Assembly:\u003c\/strong\u003e OEM separator assembly $230+; this full rebuild kit costs $26.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e45-Minute Rebuild:\u003c\/strong\u003e Disassemble separator, replace membrane and seals, reassemble.\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 Kit\u003c\/h2\u003e\n\u003cp\u003eMercedes M278\/M157 PCV oil separator repair kit (OEM ref. 2780100431) provides everything needed for a full separator rebuild on M278 4.0L\/4.6L and M157 5.5L\/6.0L V8 engines. This is the complete kit version — includes the diaphragm membrane plus all housing seals for a thorough rebuild.\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":53670279643450,"sku":"KLA2780100431","price":26.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0944\/7207\/7626\/files\/7479697799_remkomplekt-maslootdelitelya-mercedes.jpg?v=1782918251","url":"https:\/\/klifex.net\/products\/pcv-oil-separator-repair-kit-mercedes-m278-v8-4-0l-4-6l-m157-oem-2780100431","provider":"Klifex – Automotive Repair Kits","version":"1.0","type":"link"}