Talha Kırmızıaslan

Articles by Talha Kırmızıaslan on the RSS Kumru Automotive blog.

Drawing: a turbocharger in section; the oil feed pipe is undone at the turbo and lifted clear, only a thread of oil reaches the turbo, and the shaft and bearings run dry and hot; the magnifier shows the filter inside the banjo bolt blocked with carbon

October 7, 2026Turbo oil lines

Blocked turbo oil feed pipe: symptoms, checks, and can you just clean it?

A blocked feed pipe has no symptom of its own. How to prove it at the pipe and at the turbo, and when a cleaned pipe is acceptable.

Drawing: a turbocharger seen from the exhaust side and the steel oil feed line that leaves the engine, runs right beside the turbo and joins the top of it with a banjo bolt; heat radiates from the turbo, a heat shield wraps the part of the line nearest the turbo, there is burnt oil residue on the turbo housing and the pipe is dry; the magnifier shows the banjo end in section: the O-ring where the pipe enters the banjo is marked in red, with a fine oil mist around it

November 18, 2025Turbo oil lines

Mini Cooper S (R56, N14) turbo oil feed line leak: why it leaks and what to check when replacing it

On the N14 the turbo oil feed line leaks at the O-ring joint on its banjo end. Signs, effect on the turbo, the heat shield bulletin and replacement.

Drawing: a single turbocharger in section, drawn without its pipes or the engine; four causes are written on its four sides: dirty oil, a foreign object from the intake or the exhaust, overspeed and a dry first start; the magnifier shows the air-side wheel from the front, with a blade chipped by a nut that got in

August 12, 2025Turbo oil lines

The new turbo failed again: what to check besides the oil pipes

A turbo that fails again with new oil pipes was killed by something still on the engine: dirty oil, debris, overspeed or a dry first start.

Drawing: a turbocharger in section; the oil feed pipe comes up from the engine, runs over the hot exhaust side and reaches the shaft, the return pipe drains the oil back to the engine; the magnifier shows a pipe narrowed by carbon

November 18, 2024Turbo oil lines

Should you replace the oil pipes when you fit a new turbo?

Yes. The feed pipe is renewed with every turbo; the return pipe is renewed or proven clear. Why, on which engines it is critical, and the order of work.

Drawing: the path the air takes to the engine, from the air filter to the turbo, through the turbo hose to the intercooler and on to the engine; the crankcase breather hose leaves the engine, joins the intake between the filter and the turbo and feeds oil vapour into it; oil pooled in the bottom of the intercooler is marked in red; the magnifier shows the thin oil film on the inside of the turbo hose

October 8, 2024Turbo oil lines

Is oil in the turbo hose normal? Telling a normal film from a fault

Some oil is normal and comes from the crankcase ventilation. With pooled oil, blue smoke or oil consumption: the order of checks, turbo last.

Drawing: a turbocharger in section; the oil return pipe is narrowed at one point, so oil fills the bearing housing and seeps past both ends of the shaft into the exhaust side and the air side; the magnifier shows the seal ring on the shaft with oil passing it

September 3, 2024Turbo oil lines

Turbo leaking oil and blue smoke: return pipe, seals or crankcase pressure?

A turbo that leaks oil is often sound. Return pipe, crankcase pressure, air filter, oil level; what oil at each end points to, and the order of checks.

Drawing: above the threaded seat in the engine, two banjo bolts for the end of the oil feed pipe are shown side by side in section; one still has the small wire-mesh filter inside, the other has had it removed; either can go into the same seat; the magnifier shows the filter clean and starting to clog

July 24, 2024Turbo oil lines

The banjo filter in the 1.6 HDi / TDCi turbo oil feed pipe: keep it or remove it?

Turbo suppliers, the vehicle maker’s service note and workshops disagree on the 1.6 HDi banjo bolt filter. Who says what, and what to do.

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