{"product_id":"rb-bmw-n54-replacement-o-ring-for-pcv-valve-135i-335i","title":"RB PCV Valve O-Ring for BMW N54 - Replacement Seal (O-Ring Only) - Fits 135i, 335i, 535i, Z4 35i - RB01","description":"\u003cdiv class=\"product__description rte\"\u003e\n  \u003ch2\u003eRB01 Seal Ring for BMW N54 PCV Assembly\u003c\/h2\u003e\n  \n  \u003cp\u003eChasing down a pesky intake leak or crankcase pressure issue on your twin turbo N54 straight six? This RB01 seal ring is the precise rubber gasket that refreshes the PCV housing interface and restores an air‑tight crankcase breather system. We run this RB seal on our own N54 builds and customer cars with excellent results. Expect steadier idle quality, consistent boost control and smoother drivability when a tired breather seal was the cause.\u003c\/p\u003e\n  \n  \u003cp\u003eIdeal for stock and tuned setups alike, this compact seal ring is a small part that solves big headaches. It is designed to suit the RB PCV assembly and is a smart preventative maintenance item for hard‑driven cars, daily drivers and high‑boost applications.\u003c\/p\u003e\n  \n  \u003ch3\u003eWhy enthusiasts choose this seal ring\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eRestores a reliable seal in the positive crankcase ventilation system\u003c\/li\u003e\n    \u003cli\u003eHelps stop unmetered air entry that can lead to lean trims and rough idle\u003c\/li\u003e\n    \u003cli\u003eSupports stable boost pressure on mapped or hybrid‑turbo N54 builds\u003c\/li\u003e\n    \u003cli\u003eCost‑effective fix for vacuum leaks identified during a smoke test\u003c\/li\u003e\n    \u003cli\u003eDirect fit for the RB PCV housing with hassle‑free replacement\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \n  \u003ch3\u003eIncluded\u003c\/h3\u003e\n  \u003cp\u003eSeal ring only. PCV body not supplied.\u003c\/p\u003e\n  \n  \u003ch3\u003eVehicle applications\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eE82 135i\u003c\/li\u003e\n    \u003cli\u003eE90 E91 E92 E93 335i\u003c\/li\u003e\n    \u003cli\u003eE60 E61 535i\u003c\/li\u003e\n    \u003cli\u003eE89 Z4 35i\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003cp\u003eSuits BMW N54 twin turbo petrol engines equipped with the RB PCV unit.\u003c\/p\u003e\n  \n  \u003ch3\u003eWhen to replace the PCV seal ring\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eErratic idle or hesitation after heat soak\u003c\/li\u003e\n    \u003cli\u003eWhistling under light throttle or smoked intake test shows leakage\u003c\/li\u003e\n    \u003cli\u003eInconsistent boost or soft throttle response\u003c\/li\u003e\n    \u003cli\u003eElevated crankcase vapour and oily residue around the PCV housing\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \n  \u003ch3\u003ePart number\u003c\/h3\u003e\n  \u003cp\u003e\u003cstrong\u003eRB01\u003c\/strong\u003e\u003c\/p\u003e\n  \n  \u003ch3\u003eFitting and support\u003c\/h3\u003e\n  \u003cp\u003eWe offer professional fitting at MJ Modifications in Warwickshire. For a fitting quote, email \u003ca href=\"mailto:info@mjmodifications.co.uk\"\u003einfo@mjmodifications.co.uk\u003c\/a\u003e.\u003c\/p\u003e\n  \n  \u003ch3\u003eCompatibility check\u003c\/h3\u003e\n  \u003cp\u003eWe will verify suitability before dispatch. Add your UK registration or the last 7 digits of your VIN at checkout and we will confirm compatibility.\u003c\/p\u003e\n  \n  \u003ch3\u003eManufacturer and warranty\u003c\/h3\u003e\n  \u003cp\u003e\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Rob Beck RB\u003c\/p\u003e\n  \u003cp\u003e\u003cstrong\u003eWarranty:\u003c\/strong\u003e The manufacturer does not offer a warranty on this item.\u003c\/p\u003e\n  \n  \u003ch3\u003ePopular search terms\u003c\/h3\u003e\n  \u003cp\u003eBMW N54 PCV seal ring, crankcase breather gasket N54, RB PCV kit seal, 135i PCV gasket, 335i crankcase seal, 535i breather rubber ring, Z4 35i PCV O ring, N54 vacuum leak fix, intake leak seal N54, oil separator seal N54, positive crankcase ventilation gasket, RB01 PCV seal ring, Rob Beck PCV seal, N54 boost leak solution.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"RB","offers":[{"title":"Default Title","offer_id":56005768970626,"sku":null,"price":10.8,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0871\/5445\/8937\/files\/RBBMWN54REPLACEMENTO-RINGFORPCVVALVE_135I_335I_1946x_fc2f5bd0-e475-426c-b1e7-c575cf3ed9fa_1024x1024_2x-transformed.webp?v=1764022250","url":"https:\/\/mjmodifications.co.uk\/products\/rb-bmw-n54-replacement-o-ring-for-pcv-valve-135i-335i","provider":"MJ Modifications","version":"1.0","type":"link"}