17139846642

This premium auxiliary water tank (also referred to as a liquid storage tank) with OEM number 17139846642 is a precision-manufactured replacement part exclusively engineered for select BMW models, including the 525Li, 530i, 730Li, 840i, as well as specific chassis codes G38, G30, and G15. Built to adhere to BMW’s rigorous original equipment standards, this component delivers exceptional durability, reliable performance, and seamless integration with the vehicle’s engine cooling system, making it an ideal choice for professional automotive technicians and passionate BMW enthusiasts seeking to maintain their vehicle’s factory-grade performance. Designed to be installed in the engine compartment, this auxiliary water tank plays a vital role in the overall cooling system by storing excess coolant, accommodating thermal expansion during engine operation, and ensuring a consistent supply of coolant to prevent overheating—critical for preserving the performance and longevity of BMW’s high-performance engines. Constructed from high-quality, heat-resistant plastic materials that can withstand extreme temperature fluctuations and the corrosive nature of coolants, it features a robust design that resists cracks, leaks, and premature wear, even under the demanding conditions of daily driving or high-performance use. Its precise engineering mirrors the exact dimensions and specifications of the original factory part, eliminating the need for modifications or custom adjustments during installation, allowing for a straightforward, hassle-free replacement process that restores the cooling system’s optimal functionality quickly. Beyond its functional reliability, this OEM auxiliary water tank maintains the integrity of BMW’s engineered systems, ensuring that the cooling cycle operates efficiently to regulate engine temperature, protect sensitive components from thermal damage, and sustain the vehicle’s smooth power delivery and fuel efficiency. Each unit undergoes comprehensive quality control testing to meet or exceed BMW’s strict standards, providing peace of mind that you’re investing in a component that will perform consistently and dependably, whether you’re replacing a damaged or worn tank or conducting proactive maintenance to keep your BMW running at its peak.