1 1

RB

RB PCV Valve O-Ring for BMW N54 - Replacement Seal (O-Ring Only) - Fits 135i, 335i, 535i, Z4 35i - RB01

RB PCV Valve O-Ring for BMW N54 - Replacement Seal (O-Ring Only) - Fits 135i, 335i, 535i, Z4 35i - RB01

£10.80
£12.00 £10.80
Sale Sold out
Shipping calculated at checkout.

Heads-up on cancellations & returns: if you cancel an order or return an item, you won't get back 100% of what you paid. We apply a 10% restocking fee, the outbound shipping is non-refundable, and we have to pass on Shopify / PayPal payment processing fees; these aren't returned to us when we refund you. International orders also lose on exchange-rate spread in both directions. If the original packaging is damaged or missing, a reboxing charge applies. For international orders specifically, if you refuse to pay our shipping invoice or supply a prepaid label after placing the order, the same deductions apply. We're upfront about this — please be sure of your purchase before ordering.

RB01 Seal Ring for BMW N54 PCV Assembly

Chasing 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.

Ideal 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.

Why enthusiasts choose this seal ring

  • Restores a reliable seal in the positive crankcase ventilation system
  • Helps stop unmetered air entry that can lead to lean trims and rough idle
  • Supports stable boost pressure on mapped or hybrid‑turbo N54 builds
  • Cost‑effective fix for vacuum leaks identified during a smoke test
  • Direct fit for the RB PCV housing with hassle‑free replacement

Included

Seal ring only. PCV body not supplied.

Vehicle applications

  • E82 135i
  • E90 E91 E92 E93 335i
  • E60 E61 535i
  • E89 Z4 35i

Suits BMW N54 twin turbo petrol engines equipped with the RB PCV unit.

When to replace the PCV seal ring

  • Erratic idle or hesitation after heat soak
  • Whistling under light throttle or smoked intake test shows leakage
  • Inconsistent boost or soft throttle response
  • Elevated crankcase vapour and oily residue around the PCV housing

Part number

RB01

Fitting and support

We offer professional fitting at MJ Modifications in Warwickshire. For a fitting quote, email info@mjmodifications.co.uk.

Compatibility check

We will verify suitability before dispatch. Add your UK registration or the last 7 digits of your VIN at checkout and we will confirm compatibility.

Manufacturer and warranty

Manufacturer: Rob Beck RB

Warranty: The manufacturer does not offer a warranty on this item.

Popular search terms

BMW 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.

View full details