Ajusa presents a technical guide for UK professional mechanics on turbocharger lubrication, the most common installation errors, the importance of the oil feed pipe, and why reusing worn components represents an unnecessary risk.
For any professional workshop, replacing a turbocharger is a high-value repair, but it also carries significant responsibility. While installing a new turbo restores engine performance and efficiency, a premature failure during the warranty period can result in substantial financial costs and reputational damage for the workshop.
Statistically, the majority of turbocharger failures are not caused by manufacturing defects, but by lubrication-related issues. At the heart of this system lies a small yet critical component: the turbo oil feed pipe.
This article explains why replacing the oil feed pipe should be a mandatory step in every turbocharger replacement, how lubrication failures occur, and how Ajusa’s OE-quality component range helps ensure reliable, long-lasting repairs.
The importance of turbocharger lubrication
A modern turbocharger operates under extreme mechanical and thermal conditions. The shaft can exceed 200,000rpm while being exposed to extremely high temperatures generated by the exhaust gases.
Under these conditions, the thin oil film lubricating the shaft bearings is the only barrier preventing direct metal-to-metal contact and catastrophic failure.
The oil feed pipe is responsible for delivering pressurised engine oil to the turbocharger. If the oil flow is reduced, even slightly, friction increases immediately, causing a rapid rise in temperature that can lead to bearing seizure, shaft failure, or complete turbocharger destruction.
In some cases, failure of the turbocharger assembly can lead to damage to other engine components due to fragments being propelled into the intake system. Furthermore, an external loss of engine oil can result in a drop in the engine’s oil pressure, potentially causing severe engine damage.
The leakage of hot engine oil, combined with the high temperatures generated by the turbocharger or nearby exhaust aftertreatment systems, presents a significant risk of fire.
Why reusing the oil feed pipe is a risk
Cleaning and reusing the oil feed line may seem like an effective way to reduce repair costs. However, from a technical standpoint, this practice is strongly discouraged.
Ajusa’s Technical Department highlights four key reasons why the used oil feed pipe should always be replaced.
1. Carbon deposits and internal contamination. After thousands of kilometres, it is common for the oil feed pipe to accumulate carbon deposits, combustion residues, or even metallic particles. Due to the difficulty of cleaning it thoroughly, these contaminants often reach the new turbocharger, causing premature failures. In addition, the heat generated by the exhaust manifold carbonises the engine oil, forming solid deposits that reduce the internal diameter of the pipe and restrict the flow of lubrication.
2. Deformation during removal. Accessing the turbocharger requires removal of the oil feed pipe. During this process, the line may be twisted, bent or slightly deformed, creating internal restrictions or microcracks that permanently reduce oil flow.
3. Loss of sealing integrity. The fittings and flared ends of the feed line deform slightly during the initial tightening process to ensure a leak-free seal. Once removed, they lose part of their ability to conform to the mating surfaces, significantly increasing the risk of oil leaks if reused.
4. Material fatigue. Repeated heating and cooling cycles gradually reduce the mechanical properties of the feed line material. This thermal fatigue increases the likelihood of cracks and fractures caused by engine vibration.
Best practices for installing the oil feed line
To ensure a correct installation and prevent premature failures, the following recommendations should always be followed.
1. Verify the part number. Before installation, confirm that the Ajusa oil feed pipe exactly matches the vehicle application and the installed turbocharger. In addition, Ajusa’s labelling system makes it easy to identify the compatible gasket kit.
2. Pre-lubricate the turbocharger. A turbocharger should never be started dry. Before connecting the new oil feed pipe, pour clean engine oil into the turbocharger oil inlet and manually rotate the compressor wheel to lubricate the bearings.
3. Install the feed pipe without stress. The oil feed pipe must be installed without forcing, bending or placing it under mechanical stress. It is also essential to reinstall all original brackets, clamps and anti-vibration components correctly, as vibration is one of the leading causes of line fatigue and cracking.
4. Observe the specified tightening torques. All connections must be tightened using a calibrated torque wrench and according to the vehicle manufacturer’s specified torque values. Insufficient torque can result in oil leaks, while excessive torque may deform the fittings and compromise sealing performance.
5. Check the mounting and anti-vibration components. To ensure the pipe is securely fastened to the engine, it is essential that components such as mounting brackets, rubber mounts and clamps are in good condition. Inadequate support allows vibrations to be transmitted, leading to fatigue cracking at the joints shortly after installation.
A complete turbo repair with the Ajusa turbo range
As an Original Equipment (OE) manufacturer, Ajusa offers one of the most comprehensive aftermarket product ranges for turbocharger applications.
This enables professional technicians to install precision-engineered, highly durable components that meet or exceed original equipment specifications.
The dedicated turbocharger product range includes:
- Oil feed pipes, engineered to withstand high temperatures and pressures while ensuring a constant supply of lubricating oil.
- Oil drain pipes, essential for ensuring proper oil drainage back to the crankcase and preventing oil accumulation that may cause leakage.
- Coolant pipes, designed for water-cooled turbochargers to help regulate operating temperatures and prevent thermal damage.
- Turbo installation kits, including all necessary gaskets, copper washers, O-rings, studs and installation hardware required to complete a fully sealed repair.
Making oil feed pipe replacement a mandatory step in every turbocharger repair protects the customer’s investment, safeguards the workshop’s reputation and minimises the risk of repeat failures during the warranty period.
Ajusa’s dedicated turbocharger components catalogue enables technicians to quickly identify the correct part number by vehicle make, model or turbocharger reference, making it easier to perform professional repairs using components of original equipment equivalent quality.
You can see an example of how to assemble an oil feed pipe by watching the following video.
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