Category: Technical Articles

FAQ: Tackling the myths that hurt the aftermarket

Turbochargers play a vital role in modern vehicle performance, boosting efficiency, fuel economy, and emissions control. Yet the aftermarket is still shaped by long‑standing misconceptions that can lead to unnecessary replacements, misdiagnoses, and added costs. To help bring clarity, Melett has compiled a straightforward FAQ tackling the most common turbocharger myths, separating fact from fiction and giving workshops and drivers the information they need to make confident, informed decisions.

Q1: Should I repair or replace a turbocharger?

Whether to repair or replace is often a matter of choice.

Turbo repair or remanufacture is a proven, reliable, and cost‑effective option. When a turbo is professionally rebuilt using OE‑quality components, it can deliver high performance at a fraction of the cost of a new unit. For workshops and vehicle owners alike, it provides excellent value without compromising on quality.

Repair and remanufacture also deliver clear sustainability benefits. Reusing the existing turbo housing and major structures reduces waste, lowers material consumption, and minimises the environmental impact associated with manufacturing new units.

However, when repair isn’t viable, when turnaround time is the priority, or simply when the customer or workshop prefers a replacement option, high‑quality aftermarket units provide a fast, dependable solution. They offer consistent performance, immediate availability, and a reliable alternative when repair isn’t the most practical route.

Q2: Do I need to use a brand‑new OE replacement?

No, you don’t need a brand‑new OE turbocharger to achieve OE‑level reliability. High‑quality aftermarket replacements — whether repaired, remanufactured, or new — can match the performance of an OE turbo when built and installed correctly.

A professionally remanufactured turbo using OE‑quality components offers a dependable, cost‑effective alternative, delivering comparable performance while also providing clear sustainability benefits through the reuse of existing components.

Q3: Where should I get a turbo repaired?

Turbo repair should always be carried out by a specialist with the appropriate skills, equipment, and experience. Turbochargers operate under extreme conditions, so accurate fault diagnosis, precision machining, correct balancing, and clean assembly procedures are essential to achieving a reliable outcome.

Alongside specialist expertise, the quality of the components used in the repair is equally important. Reputable turbo rebuilders rely on well‑engineered parts that allow them to work to consistent standards. Products such as Melett CHRAs and components are designed to support this professional repair process, giving specialists access to parts manufactured to tight tolerances and suitable for repeatable, high‑quality rebuilds.

By choosing a recognised turbo repair specialist who uses reliable, OE‑quality components, workshops and vehicle owners can ensure the repaired turbocharger is restored to a high and consistent standard.

Q4: Do turbochargers need servicing?

No, turbochargers don’t require dedicated servicing themselves, but they rely heavily on the overall condition of the engine. Their long‑term reliability depends on correct fitment and proper vehicle maintenance — just like any other major component.

Timely oil changes, clean air filtration, and ensuring oil and air pipework is free from leaks, blockages, or damage are essential. Issues such as oil starvation, contamination, or foreign‑object damage usually originate from the engine system rather than the turbo, but they can still lead to premature turbo failure if not addressed.

Conclusion

As the turbocharger market continues to evolve, Melett remains committed to supporting the industry by equipping turbo specialists with the technical support and OE‑quality components needed to deliver dependable, repeatable repairs. By maintaining strong engineering standards, providing practical guidance, and investing in ongoing product development, Melett ensures specialists have the resources required to meet modern turbocharger demands. The company’s goal is to help the aftermarket navigate increasing system complexity and ensure that repair and remanufacture remain trusted, sustainable options well into the future.

UK’s ageing car fleet

An opportunity for turbo repair specialists

As of mid‑2025, the average age of cars on UK roads reached an all‑time high of nine years and ten months, as more drivers choose to maintain their current vehicles rather than replace them.

This shift is driven by a combination of improved vehicle durability, economic pressures, and continued hesitation about switching to electric models.

While zero‑emission cars are gradually increasing their presence, the latest available data shows they accounted for just 3.8% of the UK car parc and only 5.3% of total mileage. For the foreseeable future, the vast majority of miles will continue to be driven in older petrol and diesel vehicles – many of which rely on turbochargers that will inevitably require maintenance as they age.

For Melett, the leading supplier of precision‑engineered turbocharger parts and assemblies, this presents a clear opportunity to support the aftermarket in maintaining performance and reliability across an ageing fleet.

Melett’s extensive range of turbocharger components enables repair specialists to deliver the highest‑quality repairs, restoring performance and extending the service life of existing units. Every component is designed and manufactured to the strictest tolerances, helping repairers produce results that match – and often exceed – original equipment standards.

By supporting high‑quality repairs, Melett helps deliver both economic and environmental benefits. Extending the life of turbochargers reduces waste, minimises demand for new raw materials, and lowers the carbon footprint associated with manufacturing – all while ensuring the performance motorists expect.

When a repair is not possible, Melett also offers a complete range of brand‑new OE‑quality turbochargers. Each unit is assembled, balanced, and flow‑tested to rigorous specifications to ensure OE‑level performance throughout its lifespan. This provides repairers with a trusted, no‑compromise replacement option.

From legacy diesel and petrol models to newer vehicles showing early signs of turbo wear, Melett’s comprehensive product range and technical expertise give turbo specialists the parts and support they need to keep Britain’s ageing fleet running smoothly. At a time when replacement vehicles are less attainable and owners are choosing to keep their cars for longer, Melett offers the aftermarket a smart, sustainable, OE‑quality path forward.

Melett Expands Turbocharger Component Range

Melett has expanded its turbocharger and component range with several major new releases during Q4 2025.

  • A key addition includes a HELLA electronic actuator for Toyota Avensis and RAV4 applications  

  • Core assemblies have also been introduced for Cummins ISB 4.5D Euro 6 engine and Volvo 2.0D applications, including the XC60, XC90, S90 and V90 models 

Melett, the leading global supplier of precision-engineered turbochargers and components for the global automotive aftermarket, has further expanded its product portfolio with a series of new turbocharger components launched for Q4 2025, strengthening coverage across both passenger car and industrial applications. 

The latest additions include new CHRA units and a turbocharger actuator, designed to meet the growing demand for high-quality, OE-level replacement solutions across a diverse range of vehicle platforms. 

 One of the key releases is a new CHRAfor the widely recognised Cummins ISB 4.5D Euro 6 engine. The inclusion of this CHRA reflects Melett’s ongoing commitment to supporting commercial sectors. The Cummins ISB 4.5D Euro 6 platform is extensively used across a variety of on-highway applications, making reliable turbocharger components essential for maintaining uptime and performance. 

 Melett has also introduced a new CHRA covering Volvo 2.0D applications, including the XC60, XC90, S90 and V90 models. These vehicles represent a significant proportion of the diesel car parc, and the new CHRA provides turbocharger specialists with a dependable OE-quality solution for some of Volvo’s most popular premium models. 

 Further expanding its component range, Melett has launched a new HELLA electronic actuator for Toyota Avensis and RAV4 applications. As actuator technology becomes increasingly critical to turbocharger performance and emissions compliance, this addition supports workshops and turbo rebuilders servicing high-volume Japanese models. 

 All Melett turbocharger components are manufactured to meet or exceed original equipment (OE) specifications. Each CHRA is precisely assembled and VSR balanced in Melett’s UK and Polish production facilities, ensuring consistent reliability, durability and performance in demanding operating conditions. 

 The Q4 2025 product launches underline Melett’s continued investment in expanding coverage, providing turbocharger specialists with trusted, precision-engineered solutions backed by comprehensive technical support.  

Garages experiencing suspected turbocharger issues are encouraged to seek expert inspection and diagnosis to identify the root cause of failure and prevent repeat issues. 

Turbocharging the future: why the repair market is set to thrive

As the automotive industry continues to evolve in response to stricter emissions standards and changing consumer preferences, we at Melett see turbochargers playing a pivotal role in shaping the future of internal combustion and hybrid vehicles.

While battery electric vehicles are gaining traction, the majority of UK car buyers still prefer ICE-powered models—driving innovation in engine downsizing and turbocharger technology.

In this white paper, we examine how turbochargers have become integral to modern vehicle design, the growing demand for high-quality aftermarket repair solutions, and the environmental benefits of adopting circular economy principles.

As we celebrate 30 years of expertise in precision-engineered turbochargers and components, we’re proud to highlight why the turbo repair industry is not just surviving—but thriving.

Download the white paper in your preferred language below.

Download in English
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Download in French

Five most common mistakes when installing a turbocharger

Turbochargers have revolutionised modern engine design, enhancing power and fuel efficiency by harnessing exhaust gases to drive compressed air into the combustion chamber. As a result, turbocharged systems are now commonplace in vehicles of all types, from light commercial vans to high-performance cars. But as Melett, a leading name in precision-engineered turbocharger components, stresses, correct installation is everything. 

Melett, who supplies parts and repair solutions to the professional aftermarket worldwide, warns that improper turbocharger installation remains a leading cause of premature failure and engine damage. 

“We see the same core mistakes repeated in the field,” says Melett’s technical team. “These aren’t just minor oversights; they’re errors that can lead to full unit failure, warranty claims, and reputational damage for workshops.” 

Here, Melett explores the five most common installation errors, alongside expert advice on how to avoid them.

Improper Sealing of Joints

One of the most frequent and damaging errors involves sealing oil connections with silicone. While it might appear to offer a quick seal, silicone is wholly unsuitable for turbocharger applications. Small fragments can break loose and enter the oil system, where they may block vital passages and cause bearing seizure. 

Melett strongly advises the use of high-quality, model-specific gasket kits. These ensure a proper seal without contaminating oil flow and help maintain long-term reliability. Gaskets must be perfectly aligned; any offset could restrict flow and create avoidable wear.

 

Failure to Remove Safety Caps

A surprisingly common oversight, particularly among less experienced technicians, is failing to remove protective shipping plugs before installation. These caps are there to protect the turbo during transport but will completely block oil flow if left in place. 

Melett recommends a thorough visual inspection of all parts during pre-installation checks. This one simple step can prevent immediate and catastrophic turbo failure on first start-up.

 

Contaminants Left Behind from a Previous Failure

When a turbocharger fails, it often leaves behind debris—metal fragments, carbon deposits, or degraded oil—that can lurk in oil lines, intercoolers, and intake pipes. Fitting a new unit without properly flushing these systems is a fast track to a second failure. 

Professional installation must include complete system cleaning and, where necessary, component replacement. Melett supports the use of specialist cleaning fluids designed to remove even microscopic contaminants, safeguarding the new turbo from the outset.

 

Neglecting the Oil System

The turbocharger relies entirely on a clean, reliable oil supply for cooling and lubrication. Poor oil maintenance, incorrect oil grades, or low oil pressure are all critical risk factors. 

Before any installation, technicians must replace both the oil and the filter with OE-specified products. Melett also advises checking and clearing the oil feed and return lines and verifying oil pressure before the engine is restarted. This due diligence can prevent many avoidable call-backs. 

 

Failing to Identify the Root Cause of Previous Failures

Installing a replacement turbo without diagnosing the root cause of the original failure is perhaps the most expensive and frustrating mistake. Underlying issues—ranging from faulty injectors and clogged filters to defective EGR valves or blocked DPFs—will rapidly destroy a new turbo if left unresolved. 

Melett urges workshops to conduct comprehensive diagnostic assessments before fitting a new unit. This includes checking related engine systems that could indirectly affect turbo operation. Only by resolving these underlying faults can the technician ensure the long-term health of the new turbo. 

 

A Professional Standard: Fitting for Reliability and Reputation 

Each of these mistakes, while avoidable, can carry a heavy cost, not just in terms of parts and labour, but in reputation and customer trust. Melett emphasises that turbocharger fitting isn’t a routine replacement job, it’s a specialist task that demands care, cleanliness, and technical precision. 

“We always encourage installers to think beyond the part itself,” says a Melett technical advisor. “Every turbo is part of a wider system. Getting it right protects the engine, safeguards your reputation, and keeps customers on the road.” 

Melett’s commitment to technical support, quality components, and accurate fitment information underpins their approach to turbocharger repair and installation. 

Because when it comes to turbochargers, precision isn’t optional – it’s essential.