Genuine BMW Intercooler Charge Pipe Seal O-Ring - M57 N47 N57Twin Turbo - BMW 13718596850

Genuine BMW preformed seal ring for intercooler and charge pipe joints This is the genuine BMW preformed seal ring that seals the charge air hose connections at the intercooler inlet and outlet on turbocharged BMW engines. It is one of the most commonly overlooked parts in a boost leak diagnosis — and one of the cheapest to fix. Why replace this seal The FPM fluoroelastomer ring hardens and takes a permanent set after years of heat cycling and pressure. Once it stops sealing, pressurised charge air escapes downstream of the turbo. Common symptoms include: Loss of boost and flat, gutless power under load A whoosh, hiss or puffing noise from the intercooler piping when the engine loads up Overboost or underboost fault codes and limp mode Oily residue or grime tracking around the pipe joint A hard, flattened or cracked ring on removal Replacement is strongly recommended any time the charge air tubing, intercooler or turbo piping is disturbed — including when fitting aftermarket charge pipes or couplings. How many do you need? These are sold individually. Recommended quantity by engine: M57 diesel 4 N57 diesel 4 B57 diesel 4 N47 / B47 diesel 2 N20 / N26 petrol 2 N55 petrol 2 Specifications Part number 13718596850 Also listed as 13-71-8-596-850 / 11618506786 / 11617801974 / 11617801971 Brand Genuine BMW (OEM manufactured by Elring, ref 087.320) Inner diameter 60.4 mm Thickness 4.4 mm Profile O-shape preformed ring Material FPM fluoroelastomer — heat and oil resistant Weight 7 g Country of origin Poland What's Included 1 x Genuine BMW preformed charge air seal ring (sold individually) Vehicle Fitment Fits a very wide range of turbocharged BMW and MINI engines, including M57, N47, B47, N57, B57, N20, N26 and N55, across roughly 2004–2026 production. 1 & 2 Series E81 / E82 / E87 / E88 116d–125d, 123d F20 / F21 / F40 / F52 116d–125d, 118i–M135i F22 / F23 / F44 / F45 / F46 228i, M235i F87 M2 (N55) 3 & 4 Series E90 / E91 / E92 / E93 318d–335d F30 / F31 / F34 / G20 / G21 320i, 328i, 328d, 335i, 320d–330d F32 / F33 / F36 428i, 435i 5, 6 & 7 Series E60 / E61 520d, 525d, 530d, 535d F10 / F11 518d–535d, 528i, 535i, ActiveHybrid F12 / F13 640i F01 / F02 740i / 740Li X Series & MINI X1 E84 / F48 X2 F39 X3 E83 / F25 X4 F26 X5 E70 / F15 xDrive35d MINI F56 Important Notes Sold individually — check the quantity guide above and order the right number for your engine. Single-use item. Do not reuse an old ring once the joint has been separated. Please confirm the part number against your VIN before ordering, as BMW used several seal sizes across the charge air system. Cheap insurance whenever you are chasing a boost leak or fitting new charge piping.