There is a well-documented design defect in the factory upper radiator hose on N52-engined E8X and E9X models — the plastic flange where the hose connects to the expansion tank outlet is prone to cracking and breakage during routine maintenance or daily use, resulting in coolant leakage and dangerously elevated engine temperatures. This high-performance repair kit permanently resolves that weakness by replacing the factory plastic flange with a 6061 aluminum alloy unit and substituting the OEM hose with a triple-layer reinforced silicone hose rated to 3 bar pressure and high-temperature operation. An anti-aging silicone formula maintains long-term flexibility without hardening or cracking, and upgraded stainless steel hose clamps replace the factory units that are unsuitable for reuse after extended service.

Features:

• 6061 anodized aluminum alloy flange replaces the factory plastic flange – permanently eliminates the risk of breakage and coolant leakage at the expansion tank connection point
• Triple-layer reinforced silicone hose rated to 3 bar pressure and high operating temperatures – purpose-built for long-term cooling system reliability
• Special anti-aging silicone formula maintains flexibility over time – no hardening, no cracking, and no sealing failure risk
• Upgraded stainless steel hose clamps included – factory clamps are not suitable for reuse after extended service and are replaced as part of this kit
• Direct replacement for OEM part number 17127531579 – N52 engine applications only

Specifications:

• Condition: 100% Brand New
• Type: Upper Radiator Hose Repair Kit
• Material: 6061 Aluminum Alloy · Silicone · Stainless Steel
• Flange Finish: Anodized
• Hose Construction: Triple-Layer Reinforced Silicone
• Pressure Rating: 3 Bar
• Mounting Position: Engine to Radiator (expansion tank outlet connection)
• Engine: N52 only
• OEM Replacement Part No.: 17127531579
• Item Weight: 0.516 kg

Fitment:

• BMW 1 Series E81 130i (2006–2010) – EUR market only
• BMW 1 Series E82 125i · 128i (2006–2013)
• BMW 1 Series E87 130i (2005–2007) – EUR market only
• BMW 1 Series E88 125i · 128i (2006–2013)
• BMW 3 Series E90 323i · 325i · 328i · 330i (2005–2011)
• BMW 3 Series E91 323i · 325i · 328i · 330i (2005–2011)
• BMW 3 Series E92 323i · 325i · 328i · 330i (2005–2011)
• BMW 3 Series E93 323i · 325i · 328i · 330i (2005–2011)
• BMW X1 E84 25ix · 28ix (2009–2011) – EUR market only
• N52 engine fitment only – confirm engine code before ordering

Contents:

• 1x 6061 Anodized Aluminum Alloy Flange
• 1x Triple-Layer Reinforced Silicone Upper Radiator Hose
• Upgraded Stainless Steel Hose Clamps included

Benefits:

• Permanently resolves the known factory plastic flange failure point on N52 E8X and E9X cooling systems
• Triple-layer silicone hose and 3 bar pressure rating provides significantly greater cooling system integrity than the OEM rubber hose
• Anti-aging silicone formula ensures long-term flexibility – avoiding the gradual hardening and cracking that causes OEM hose sealing failures
• Complete kit eliminates the need to source a replacement flange, hose, and clamps separately
• Anodized aluminum flange provides a cleaner, more premium appearance compared to the factory plastic unit

Installation Notes:

• Compatible with N52 engine applications only – confirm engine code before ordering
• Do not reuse factory hose clamps – replacement stainless steel clamps are included in this kit
• EUR market fitment restrictions apply to E81 130i, E87 130i, and X1 E84 25ix / 28ix variants – confirm market specification before ordering
• If unsure about compatibility, contact our team with your vehicle's year, model, and engine code prior to purchase

Warranty:

• 12-month standard warranty from date of purchase
• Contact our support team for assistance with any issues