Genuine BMW Turbocharger Air Inlet Duct Sealing Ring for M57N2 Twin Turbo - BMW 13717799839

Genuine BMW turbocharger air inlet sealing ring for M57 3.0L diesel engines This is the large-diameter genuine BMW rubber sealing ring that seals the air intake ducting to the turbocharger inlet on M57 3.0 litre diesel engines. It is a critical sealing point on the intake side of the turbo — any leak here lets in unmetered air and immediately upsets fuelling and boost control. Why replace this seal The ring lives in a hot engine bay and hardens, shrinks and cracks over time. Common symptoms of a failed or tired inlet seal include: Loss of boost or sluggish power under load Whistling, hissing or sucking noise from the turbo inlet area Limp mode and boost-pressure or air-mass related fault codes Rough or uneven idle from unmetered air entering after the MAF sensor A visibly perished, split or distorted ring on removal This is a single-use item. It should be replaced any time the turbocharger, intake ducting or air filter housing is removed — including during a turbo rebuild or an M57 engine swap. It is cheap insurance against chasing a boost leak later. Specifications Part number 13717799839 Also listed as 7799839 / 13-71-7-799-839 Brand Genuine BMW Material Moulded EPDM rubber Weight 34 g Country of origin Italy What's Included 1 x Genuine BMW turbocharger air inlet duct sealing ring Vehicle Fitment BMW M57N2 (306D5) 3.0 litre diesel engines, including: 3 Series E90 / E91 / E92 / E93 335d (including LCI) 5 Series E60 / E61 535d (including LCI) X Series E70 X5 xDrive35d / 3.0sd E71 X6 xDrive35d E83 X3 3.0sd Important Notes Please confirm the part number against your VIN before ordering — BMW revised intake components across the M57 production run. Some catalogues incorrectly list this part as an intake manifold gasket or crankcase breather seal. It is the large ring seal at the turbocharger air inlet. Single-use item — do not reuse an old seal after disturbing the turbo inlet. Genuine BMW part, sold individually.