Note: This article contains affiliate links. If you click on these links and make a purchase, I may earn a small commission at no extra cost to you. This helps support my research and content. Read my full affiliate disclosure here.
If you own a Mercedes-Benz GLA, maintaining the oil cooler lines is important for engine health and reliable operation. Worn or damaged lines can lead to leaks, higher oil temperatures, and potential engine stress, so choosing the right replacement matters. This guide covers the top shortlisted oil cooler lines for the Mercedes-Benz GLA, focusing on proper fitment, material quality, and ease of installation. Read on to understand the evaluation criteria used and what to consider before selecting a set of lines for your vehicle.
Looking for other parts? See all Mercedes-Benz GLA parts & accessories.
Top Picks at a Glance
| Best Reviewed A top-rated pick with lots of positive feedback | A-Premium Engine Oil Cooler Line Hose Assembly |  |
| Best Quality Built to a higher standard if you want something more solid | A-Premium Transmission Oil Cooler Line Hose Assembly, Set of 2 |  |
| Best Budget The cheapest option that still gets the job done reliably | A ABSOPRO Engine Oil Cooler Tube for BMW 535i E60/E61 |  |
| Most Sold A high-volume bestseller chosen again and again | dokoyeo Engine Oil Cooler Lines with Gaskets (2-piece) |  |
| Best Overall The best all-around choice for most situations | A-Premium Engine Oil Cooler Line Hose Assembly |  |
1. A-Premium Engine Oil Cooler Line Hose Assembly
| Manufacturer Part Number | APOCL166 |
|---|---|
| OEM Part Number | 625-513, 625513, 5801369, 11361705532 |
| Material | Rubber/Metal |
| Fitment Type | Direct Replacement |
This A-Premium oil cooler line hose assembly is a direct-replacement plumbing piece intended to route engine oil between the engine and oil cooler on compatible BMW VANOS-equipped engines. It is typically used when an original line has leaking joints, cracks, or corrosion; installation involves disconnecting the old line and fitting the replacement to factory connection points. Notable features include a rubber-and-metal construction for corrosion resistance and factory-fit design intended to match OEM mounting points and reference numbers. In practice the part offers straightforward fitment for the listed BMW models and, when installed correctly, restores oil circulation without leaks. Limitations are that fitment is limited to the specific BMW reference numbers and model years listed and buyers must confirm engine compatibility before ordering; the part listing also provides minimal technical detail beyond material and reference numbers. The product includes a one-year unlimited-mileage guarantee from the brand which adds confidence but does not replace confirming fitment with your vehicle first.
Best for: Reliability-focused buyers who prioritize restoring factory-spec oil routing and prefer a budget-conscious, direct replacement to stop leaks and avoid repeat repairs.
Less Ideal for: Buyers seeking parts for Mercedes-Benz GLA vehicles or those needing a universal or multi-vehicle solution should look elsewhere.
- Direct-replacement design intended to match factory connection points for straightforward installation
- Rubber-and-metal construction aimed at resisting corrosion and reducing leak risk
- Lists OEM reference numbers to simplify cross-referencing with factory parts
- Compatibility restricted to the specific BMW reference numbers and model years; not universal
- Limited published technical details about hose routing and fittings beyond basic material and length
Verdict A straightforward, corrosion-resistant direct-replacement oil cooler line for the listed BMW reference numbers that works well when fitment is confirmed, but it is not a universal part.
2. A-Premium Transmission Oil Cooler Line Hose Assembly, Set of 2
| Compatible Models | Mercedes‑Benz ML320 1998–2003, ML350 2003–2005 |
|---|---|
| Material | Metal and rubber |
| Reference Numbers | 5801367, 1635010424 |
| Fitment Type | Direct Replacement |
This A-Premium hose assembly replaces the transmission oil cooler inlet and outlet lines with a factory-replacement style unit intended to stop leaks and maintain transmission cooling. It is supplied as a set of two lines constructed from metal and rubber components that resist corrosion and routing damage common on older Mercedes models. Installation follows standard underhood and underbody routing and is intended for technicians or experienced DIYers replacing aged, cracked, or leaking lines. The practical benefit is restoring reliable fluid circulation through the cooler so the transmission runs at proper temperatures and avoids overheating-related wear. Because the kit is a direct replacement for the listed ML320 and ML350 model years, it simplifies fitment checks and reduces modification during install. Limitations are that the listing targets specific W163 ML models only, so fitment is not guaranteed for other Mercedes models, and buyers should verify reference numbers before ordering; professional installation may be required for corrosion‑stuck fittings.
Best for: Performance-oriented buyers who prioritize restoring or maintaining transmission cooling and want a factory-replacement style solution to keep operating temperatures in check during spirited driving.
Less Ideal for: Buyers seeking a universal or multi-model solution should look elsewhere, and those who prefer a custom high-performance braided line option for track use may need a different product.
- Sold as a matched inlet and outlet pair for complete cooler line replacement
- Metal and rubber construction intended to resist corrosion and provide a leak‑resistant seal
- Designed as a direct replacement to simplify fitment and reduce modification during install
- Fitment information is limited to specific ML320 and ML350 years so it may not apply to other Mercedes models
Verdict A matched pair of factory-style transmission cooler lines aimed at restoring reliable cooling for the specified Mercedes ML models, best for buyers focused on maintaining transmission performance.
3. A ABSOPRO Engine Oil Cooler Tube for BMW 535i E60/E61
| Material Type | Stainless Steel |
|---|---|
| Installation location | Outlet |
| Fitment | BMW 535i E60/E61 2008-2010; 535i xDrive 2009-2010; 535xi 2008 |
| OE Number | 17227560980 |
This stainless steel engine oil cooler tube replaces a failed or corroded outlet hose and restores coolant flow between the oil cooler and the engine's oil cooling unit. It is intended as a direct-fit aftermarket replacement for specified BMW E60/E61 variants and installs in place of the original pipe without modification. Notable features include stainless steel construction resistant to heat and corrosion and reinforced crimped fittings to reduce leak risk under pressure and temperature cycles. In practice the tube helps maintain normal oil temperature by ensuring reliable coolant circulation, which supports engine performance and longevity. Limitations are that this is a non-factory replacement part so fit and finish may vary compared with factory-quality components, and compatibility is listed only for certain BMW model years so cross-checking part numbers is important. For anyone replacing a damaged oil cooler line, this provides a durable, low-cost option, but installers should verify fitment and inspect mating seals during installation.
Best for: Budget-conscious buyers who prioritize low-cost, functional repairs and are comfortable using an aftermarket replacement to restore coolant flow and oil temperature control.
Less Ideal for: Buyers seeking factory-quality, brand-specific parts for warranty-sensitive repairs or those who require guaranteed fitment for vehicles outside the listed BMW E60/E61 models should look elsewhere.
- Stainless steel construction offers strong resistance to heat, corrosion, and engine fluids.
- Reinforced crimped fittings designed to reduce leaks under pressure and temperature changes.
- Sold as a single direct-replacement tube for quick swap without modification.
- Not an OEM part so fit, finish, and long-term durability may differ from factory replacement.
- Fitment is specified only for certain BMW E60/E61 years so it may not match other vehicles.
Verdict A sturdy, low-cost stainless steel replacement tube that restores oil cooler coolant flow for specific BMW E60/E61 models but is a non-factory aftermarket part so verify fitment before buying.
4. dokoyeo Engine Oil Cooler Lines with Gaskets (2-piece)
| Material Type | Rubber |
|---|---|
| Included Components | 2 Engine Oil Cooler Lines + 4 Rubber Sealing Gaskets |
| Item Count | 1.0 Count |
These engine oil cooler lines are sold as a two-piece kit with four rubber sealing gaskets to replace worn or leaking oil cooler lines. They are designed for direct installation and come with matching gaskets so you can swap the lines without sourcing seals separately. In typical use you remove the old oil cooler lines, fit the supplied gaskets, and install the replacement hoses to restore proper oil circulation to the cooler. The listing emphasizes inspection and testing prior to shipping, and the rubber construction is what you would expect for flexible coolant and oil routing. Practical benefits include having both lines and gaskets in one package and a straightforward installation path for a mechanic or competent DIYer. Limitations are that the listing shows measurements and material but does not include vehicle-specific certification or detailed torque/installation instructions, so confirm fitment and follow factory tightening specs. Expect a basic, no-frills replacement that restores function rather than upgrades durability or performance.
Best for: A risk-averse mainstream buyer seeking a straightforward replacement that minimizes parts sourcing and downtime when maintaining their vehicle.
Less Ideal for: Those looking for an upgraded high-performance or higher-temperature oil line solution or anyone who needs certified or OEM-branded parts for warranty-sensitive repairs.
- Includes both oil cooler lines and four rubber sealing gaskets for a complete swap
- Rubber construction provides the flexibility needed for routing and vibration isolation
- Sold as a matched pair which reduces the risk of mismatched parts during replacement
- No vehicle-specific installation instructions or torque specs provided in the listing
- Material and measurements are given but there is no explicit durability testing standard or certification listed
Verdict A simple, matched-pair replacement kit that brings back oil cooler line function with the convenience of included gaskets but without performance upgrades or OEM certification.
5. A-Premium Engine Oil Cooler Line Hose Assembly
| Material Type | Stainless Steel |
|---|---|
| Unit Count | 1.0 Count |
| Item Weight | 0.53 Kilograms |
This A-Premium oil cooler line is a direct-replacement assembly intended to restore the oil cooler feed on compatible vehicles. It is constructed from stainless steel and comes preassembled to simplify installation, so technicians or experienced DIYers can typically swap it in without modifying surrounding components. The stainless construction promises better corrosion resistance than many rubber or aluminum lines, which helps reduce the risk of leaks over time. The listing references a factory-style fit and a manufacturer reference number to help confirm compatibility. In practice the part offers straightforward performance for repairing a leaking or failed cooler line, but fit can be sensitive to exact engine variants as one reviewer reported a seal mismatch at the filter housing, so double-check mating surfaces before installation. The product includes a one-year unlimited-mileage guarantee limited to the part cost, so any post-install issues may require returning the part rather than covering labor. This makes it a practical, robust option for replacing a worn oil cooler line when fitment is confirmed.
Best for: Balanced all-round buyers who prioritize a durable, factory-style repair and want a ready-to-install replacement part that minimizes installation time and future corrosion concerns.
Less Ideal for: Drivers who need guaranteed perfect fitment for a non-BMW vehicle or who prefer a supplier that covers labor and consequential repair costs under warranty should look elsewhere.
- Stainless steel construction for improved corrosion resistance and durability
- Preassembled hose assembly simplifies installation compared with building a line from parts
- Marketed as a direct replacement to match original mounting points and routing
- Includes a one-year unlimited-mileage guarantee covering part defects
- Fitment can be sensitive to specific engine variants and mating surfaces, risking imperfect seals
- Warranty covers only the cost of the part and not installation or related expenses
Verdict A durable, preassembled stainless steel oil cooler line that makes a practical factory-style repair when fitment to the engine variant is confirmed.
Choosing the Right Mercedes-Benz GLA Oil Cooler Lines: Key Factors to Consider
Correct Fitment and Compatibility
Proper fitment is essential because oil cooler lines must connect precisely to the engine and cooler assemblies to form a reliable seal. Lines that match the GLA's factory routing reduce strain at attachment points and lower the risk of rubbing or chafing against chassis components.
Compatibility also covers thread types, flare styles, and quick-connect fittings. Choosing lines with the correct fittings avoids makeshift adapters that can introduce leak paths or compromise fluid flow.
Material and Construction Quality
The materials used determine how well lines resist heat, oil exposure, and road contaminants. Look for hoses and lines made from high-temperature synthetic rubbers, Teflon-lined hoses, or braided stainless steel over rubber for enhanced abrasion resistance and longevity.
Construction quality includes crimped or swaged fittings, corrosion-resistant metal end pieces, and secure hose-to-fitting bonds. Poorly constructed junctions are common failure points, so robust assembly reduces the chance of premature leakage.
Sealing and Fitting Types
Seals and fitting styles affect leak resistance and serviceability. Options include O-ring fittings, banjo fittings, flared fittings, and threaded adapters. Each style has pros and cons for sealing under pressure and for re-use during service.
Ensure the chosen line uses the same sealing method as the original Mercedes-Benz GLA components or supplies compatible sealing hardware. Proper seals and torque specs are important to prevent slow seepage that can be hard to detect.
Installation Accessibility and Tools Required
Some oil cooler line replacements are straightforward, while others require lifting the vehicle, removing splash shields, or accessing tight engine-bay spaces. Assess how accessible the mounting points and fittings are before choosing a line.
Consider whether special tools or line-fitting sockets are needed and whether replacement includes necessary clamps or brackets. Easier-to-install designs reduce labor time and the chance of installation-related damage.
Durability and Maintenance
Durability considerations include resistance to oil breakdown, thermal cycling, and mechanical wear from vibration. Select lines rated for the engine oil types you use and for the operating temperatures typical of the GLA.
Also consider maintenance factors such as the availability of replacement hoses, fittings, and clear instructions for periodic inspection. Durable lines with accessible service parts simplify long-term ownership.
FAQ
How can I tell if my Mercedes-Benz GLA oil cooler lines are failing?
Common signs include visible oil spots under the vehicle, a gradual drop in engine oil level, or a noticeable oil smell after driving. You might also see oil on nearby components or experience higher than normal oil temperature readings. If you suspect a leak, visually inspect the lines and fittings for wetness or cracking and address issues promptly to avoid engine damage.
Can I replace oil cooler lines myself on a Mercedes-Benz GLA?
Many owners with basic mechanical skills can replace oil cooler lines, but accessibility varies by model year and engine layout. Expect to remove covers or work in tight spaces, and be prepared with proper wrenches and replacement seals. If you are unsure about torque specifications or fitting types, consider professional installation to ensure reliable sealing.
Are aftermarket oil cooler hose kits reliable for the GLA?
Aftermarket kits can be reliable when they provide clear fitment for the Mercedes-Benz GLA, use high-quality materials, and include proper fittings. Verify construction details such as braided reinforcement and crimped fittings, and look for manufacturer information on temperature and pressure ratings to ensure durability in service.
What should I do if I detect an oil cooler line leak while driving?
If you notice a significant oil leak or rapid oil pressure loss, stop driving as soon as it is safe and shut off the engine to prevent damage. For minor drips, avoid extended driving and arrange inspection and repair. Keep in mind that leaks near hot components can be a fire risk, so address persistent leaks promptly.
Do oil cooler line fittings require special seals or washers?
Yes. Many fittings rely on specific O-rings, crush washers, or sealing washers sized for the connection. Re-using old seals is often not recommended because they can be deformed or hardened. When replacing lines, install new seals that match the fitting style and follow recommended torque values to ensure a proper seal.
How We Chose the Best Mercedes-Benz GLA Oil Cooler Lines
To assemble this list we evaluated five oil cooler line options for the Mercedes-Benz GLA using criteria that matter to owners and independent technicians. Key selection filters included correct vehicle fitment and factory-compatible fittings; hose and line material quality, including corrosion resistance and heat tolerance; manufacturing and assembly standards such as crimping quality and braided or reinforced construction; and serviceability factors like ease of installation and availability of replacement fittings or kits. We also considered durability indicators such as warranty support and common failure modes reported by owners and shops. Exclusions: we excluded parts lacking clear fitment data for the Mercedes-Benz GLA, aftermarket items without documented material specifications, and hoses or lines intended only for other vehicle models. The final picks prioritize correct fit, long-term sealing performance, and installer-friendly design features.
Our full evaluation process is outlined in our review methodology.
Conclusion
Choosing the right oil cooler lines for a Mercedes-Benz GLA comes down to fitment accuracy, material and construction quality, and how easy the parts are to install and service. Prioritize parts that match factory fittings, use durable materials, and provide clear sealing hardware to minimize the chance of leaks. Balance the need for long-term durability against installation complexity and maintenance access. With those tradeoffs in mind, focus on options that offer correct routing and robust connections so the lines protect the engine under regular and high-load conditions.
Explore More:
- Check out all Mercedes-Benz GLA parts & accessories
- Explore Cooling System
- Browse all Auto Parts
