Complete 9-Piece Silicone Coolant Hose Kit BMW E36 320i 325i 328i M52B20 M52B25 M52B28

Definition and Technical Specifications

The REDOX 9-piece silicone hose kit for BMW E36 provides a direct and complete replacement for the original engine cooling system. Specifically engineered for BMW 3 Series E36 equipped with M52 engines (320i M52B20 2.0L, 325i/323i M52B25 2.5L, 328i M52B28 2.8L produced between 1994 and 2000), this kit ensures perfect sealing and exceptional thermal resistance.

REDOX hoses utilize VMQ silicone (methylvinyl polysiloxane) with reinforced 3-ply construction and 4mm wall thickness. This composition delivers continuous resistance to extreme temperatures from -50°C to +180°C, vastly superior to original rubber hoses that degrade from 100°C onwards. The multi-layer structure incorporates reinforcement fibers that maintain hose shape even under high pressure, eliminating risks of expansion, cracking, or bursting.

Each kit includes a complete set of stainless steel hose clamps precisely sized for each hose. Installation is performed in place of original hoses without any modification, following the factory cooling circuit layout.

Applications and Compatible Models

This 9-hose kit is compatible with all BMW E36 equipped with M52 engines:

BMW 320i E36 (1994-1998) equipped with M52B20 inline 6-cylinder 2.0L engine producing 150 hp. Versions include 4-door sedan, 2-door coupe, convertible, and Touring (wagon).

BMW 325i E36 (1995-1998) and BMW 323i E36 (1995-2000) equipped with M52B25 inline 6-cylinder 2.5L engine producing 170 hp. The 323i model replaced the 325i in 1995 in certain markets while retaining the same engine. Compatible with all body styles.

BMW 328i E36 (1995-1999) equipped with M52B28 inline 6-cylinder 2.8L engine producing 193 hp. Versions include sedan, coupe, convertible, and Touring.

M52 engines are characterized by their inline 6-cylinder architecture, double overhead camshaft (DOHC), VANOS variable valve timing system, and aluminum block (European and Asian markets) or cast iron block (North American market). This kit suits both block versions.

OEM References for Original Hoses

REDOX hoses directly replace the following original BMW references for the M52 engine cooling circuit:

• Upper radiator hose: BMW 11531726344
• Lower radiator hose: BMW 11531709585
• Thermostat to cylinder head hoses
• Water pump to radiator hoses
• Expansion tank to circuit hoses
• Cabin heater circuit hoses
• Return circuit hoses

The 9-piece kit ensures complete water circuit replacement without requiring additional hoses. Diameters and lengths strictly conform to BMW specifications to guarantee perfect fitment.

Permanent Stock and Fast Delivery UK and Europe

REDOX maintains permanent stock of BMW E36 M52 hose kits in its French warehouse. Orders placed before 5 PM Monday to Friday are shipped the same day. Delivery is handled via GLS courier with guaranteed delivery time of 24 to 48 hours for the UK and neighboring countries (Belgium, Luxembourg, Germany, Switzerland).

Each package is carefully prepared with reinforced packaging to protect the silicone hoses during transport. A GLS tracking number is automatically sent by email upon shipment to track your order in real time.

Immediate stock availability eliminates the usual waiting times of 2 to 6 weeks observed with many silicone hose suppliers. REDOX guarantees shipment of your order within 24 working hours maximum.

Main Technical Characteristics

• Composition: High-performance VMQ silicone with chemical resistance to coolants
• Structure: 3-ply polyester fiber reinforced for maximum mechanical strength
• Wall thickness: 4mm throughout length for stress absorption
• Temperature resistance: -50°C to +180°C continuous operation, peaks to 200°C tolerated
• Operating pressure: Up to 2 bar (high-pressure cooling circuits compatible)
• Chemical resistance: Compatible with all coolants (G11, G12, G12+, G12++, G13, BMW Original)
• Available colors: Racing blue, discreet black, competition red (identical performance for all colors)
• Supplied clamps: Adjustable stainless steel worm-drive clamps for optimal tightening
• Lifespan: Lifetime REDOX warranty, minimum durability 15 years in normal use
• Installation: Direct fitment without modification, 100% compatibility with original circuit

VMQ silicone maintains its flexibility and elasticity over time, unlike original EPDM rubber that hardens and cracks after 5 to 7 years. REDOX hoses require no preventive replacement and represent a long-term investment for your BMW E36.

FAQ Section

Q1: Why replace original rubber hoses with silicone?

BMW original EPDM rubber hoses present several weaknesses: progressive hardening from 5 years of use, appearance of microcracks on bends, expansion under pressure reaching 15% of nominal diameter, and accelerated degradation upon contact with engine oil in case of leaks. VMQ silicone eliminates these problems by maintaining its flexibility over several decades and offering superior chemical resistance.

Q2: Is this kit compatible with my BMW E36 if I have modified the engine?

REDOX hoses support engine modifications up to 450 hp. They are regularly used on E36 equipped with turbos, superchargers, or highly tuned naturally aspirated builds. The 180°C continuous resistance allows managing elevated circuit temperatures. For extreme builds exceeding 500 hp, REDOX offers reinforced 5-ply versions upon request.

Q3: Are the supplied clamps of sufficient quality or should they be replaced?

REDOX stainless steel clamps are specifically sized for each hose in the kit. Their band width (9mm minimum) distributes clamping pressure and prevents marking the silicone. No replacement is necessary. It is recommended to apply moderate torque (3-4 Nm maximum) as silicone naturally provides sealing.

Q4: What is the actual lifespan of REDOX silicone hoses?

The lifetime REDOX warranty is effective: no failure cases have been observed on correctly installed hoses, even after 15 years of intensive motorsport use. VMQ silicone undergoes no UV aging (under hood) or thermal degradation in the automotive use range. Customer feedback reports minimum durability of 15 years without performance loss.

Q5: Can I install these hoses myself or must I use a garage?

Installation presents no particular technical difficulty for a DIY enthusiast with basic mechanical knowledge. Simply drain the cooling system, remove old hoses while noting their position, install new REDOX hoses with supplied clamps, and refill and bleed the cooling system. Allow 2 to 3 hours for a first complete installation.

Q6: Do REDOX silicone hoses modify the vehicle's cooling performance?

Cooling performance remains strictly identical to original hoses or is slightly improved. Silicone transfers heat comparably to rubber, but the absence of expansion under pressure maintains optimal flow in the circuit. Some users notice more stable engine temperature in sporting use thanks to absence of hose deformation under stress.

Q7: How do I choose the color: is there a performance difference?

The three colors (blue, black, red) offer exactly the same technical performance. The choice is purely aesthetic: blue evokes competition and is highly visible under the hood, black offers a discreet and elegant appearance close to original, red is preferred for sporting builds. The pigments used are UV-stable and do not fade.

Q8: Are these hoses compatible with all coolants?

REDOX hoses are compatible with all coolants on the market: BMW original fluid (blue or green), G11, G12, G12+, G12++, G13 standards, universal coolants based on ethylene glycol or propylene glycol, and even pure demineralized water used in competition. VMQ silicone reacts with none of these fluids and preserves the anti-corrosion properties of additives.