X4XZ Crankcase Vent Hose 11127588417 for BMW 2012–2018 — OE-fit, Oil Leak Prevention

The X4XZ 11127588417 crankcase vent hose is a direct-fit replacement that restores proper crankcase ventilation and helps prevent oil leaks on compatible 2012–2018 BMW engines.

If your BMW is showing oil seepage near the valve cover or you hear unusual blow-by noises, the crankcase vent hose can be a common wear point. This X4XZ replacement part is manufactured to OE dimensions to make swapping the old hose straightforward, and it’s intended for multiple BMW 2-, 3-, 4-, 5-series models plus select X and Z models from 2012–2018. The piece focuses on durability and sealing performance so engines maintain stable internal pressure and reduce the risk of oil migration into intake areas.

Which BMW models will this X4XZ vent hose fit?

This hose is compatible with a wide range of BMWs from model years shown in the fit list. Fitment covers many naturally aspirated and turbocharged four-cylinder variants used across 2, 3, 4, 5-series and several X and Z models.

• 228i (2014–2016), 228i xDrive (2015–2016)
• 320i (2013–2017) and 320i xDrive (2013–2017)
• 328i (2012–2016), 328i xDrive and GT variants (2013–2016)
• 428i/428i Gran Coupe/428i xDrive (2014–2016)
• 528i and 528i xDrive (2012–2016), X1/X3/X4/X5/Z4 specified models

How does this crankcase vent hose improve engine performance?

By maintaining a reliable path for crankcase ventilation, the hose helps keep internal engine pressure within designed limits so seals and gaskets are less stressed. Proper ventilation also reduces oil carryover into the intake, which supports consistent combustion and cleaner intake surfaces over time.

• Restores correct crankcase-air routing to reduce pressure spikes.
• Limits oil migration that can foul intake components.
• Helps the engine run closer to factory performance and emissions expectations.

Is installation difficult — what should I expect when replacing it?

The X4XZ 11127588417 is produced to match OE shape and connection points so it installs without modification. Basic hand tools are usually sufficient; replacement typically involves removing the old hose, cleaning mating surfaces, and clipping the new hose into place.

• Direct-fit design avoids trimming or adapters.
• Standard clamps or OEM-style connectors are used for secure sealing.
• Most owners or mechanics can complete the swap in a short service session.

What durability and warranty support does X4XZ provide?

The hose is made from materials chosen to resist heat and oil exposure common in engine compartments. X4XZ backs the product with a one-year coverage window and offers customer support for installation or quality questions.

• Constructed to withstand elevated under-hood temperatures and pressures.
• Manufactured to OE dimensional tolerances for reliable sealing.
• Includes 24-hour customer service and a one-year product service policy.

Who is this for: Enthusiasts and owners who drive the listed BMW models and need a dependable replacement for a cracked, porous, or leaking crankcase vent hose. It’s aimed at DIY mechanics and professional shops seeking an OE-dimensioned aftermarket part to restore ventilation function, reduce oil leaks, and maintain engine reliability without extensive modification.