Why replace the oil filler pipe and turbocharger gaskets

When replacing a turbocharger, attention is often focused exclusively on the main component.

In fact, one of the most critical aspects—and too often overlooked—is replacing the oil filler pipe and its gaskets.

Neglecting these components is one of the most common causes of premature failure in a newly installed turbocharger.

A turbocharger is generally replaced after 100,000–150,000 km.
During this time, carbon deposits accumulate inside the oil filler pipe, fittings, and any filters.

The latter, once the tube has been “moved” to remove the turbo, can be released at any time, obstructing, even partially, the oil inlet which normally never exceeds a millimetre and a half: even the smallest impurity is enough to cause immediate damage.

The vital role of the oil filler hose

The oil inlet tube is the direct connection between the engine and the turbocharger, which operates under extreme conditions:

• • Very high temperatures
  • Rotation speeds that can exceed 200,000–250,000 rpm

To function properly, the turbo depends exclusively on constant and clean lubrication. If this tube is not in perfect condition, the oil flow will be insufficient or irregular, immediately compromising the turbo’s performance.

The greatest risk in flexible hoses

The situation becomes even more critical when the oil filler hose is flexible, i.e., rubber covered with a steel mesh. Working in close contact with the turbocharger, these hoses are exposed to very high temperatures. Over time, the rubber hardens, loses elasticity, and degrades.

The risk is the release of micro-fragments of rubber into the oil circuit.
Even tiny particles are enough to irreversibly damage the turbo.

The importance of replacing gaskets

In addition to the oil filler pipe, it is essential to replace all gaskets connected to the turbo’s lubrication system.

Old or deformed gaskets can cause:

• • Micro-oil leaks
  • Pressure drops
  • Air infiltration into the circuit

All factors that reduce the effectiveness of lubrication and seriously jeopardize the life of the turbocharger.

Conclusion

At DEPROS, we work daily with turbochargers and their components. Field experience has shown us that a turbo replacement performed without changing the oil filler pipe and seals is an incomplete repair.

For this reason, DEPROS provides:

• • New oil filler pipes, designed to ensure optimal flow
  • Seal kits, compliant with lubrication system specifications

This approach allows you to:

• • Protect the turbocharger
  • Prevent premature failure
  • Ensure professional and long-lasting service

In the world of turbochargers, the details make the difference. And the lubrication system is one of those details that cannot be ignored.