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SIX-IN-LINE BMW specialist workshopAppointments

04 / ZF 6HP AND ZF 8HP

Automatic transmission service.Built on rebuilding expertise.

10 years of transmission rebuilding experience behind every oil change. ZF automatic transmission service and rebuilding in Őcsény, near Szekszárd.

We understand how the transmission works, its internal construction and typical wear. We apply that knowledge to every job, from oil changes to documented rebuilding.

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Discover how we work
Close-up of an automatic transmission internal assembly in the Six-In-Line workshop.
We know the transmission from the inside.
10 yearsof automatic transmission rebuilding experience
For 8 yearsexclusively ZF oils, filters and seals
6HP / 8HPevery type in both ZF transmission families
Before and afterclutch clearances recorded in the measurement report

01 / TRANSMISSION OIL CHANGE

This is transmission service.From specialists who understand the transmission from the inside.

Automatic transmission mechatronics on the workbench with coloured connectors.
From mechatronics to the oil level: details matter.

Exclusively ZF materials for 8 years

We use exclusively ZF oils, filters and seals to service ZF transmissions. Always selected for the specific transmission type.

A thorough oil change matched to the transmission’s construction

We know where used oil can remain in the system and how to help remove it before flushing. Where necessary, we professionally detach the valve body to assist drainage. On ZF 6HP transmissions, we also pay particular attention to oil remaining in the torque converter.

During flushing, we examine the colour, condition and contamination of the outgoing oil. We assess these observations alongside transmission operation and diagnostic data.

Used oil also reveals the transmission’s condition

We inspect deposits in the oil pan and on the magnets. We assess the type and amount of wear debris, including any bronze particles. Our rebuilding experience helps identify signs that require further investigation.

We check for signs of leakage, inspect ageing seals and replace seals where necessary. We assess adaptation values for the specific transmission type. Where warranted and accessible, we also measure clutch clearances.

An accurate oil level and a professional finish

We set the oil level to the specifications for the transmission, taking oil temperature into account. Where needed, we can also perform related diagnostics, software updates and coding.

Request a transmission oil change appointment

SONNAX VACUUM TESTING METHOD

Valve body testing.Vacuum testing. Measurable results.

The valve body controls the transmission’s hydraulic operation. Wear in the valves and their bores can cause internal leakage, incorrect pressures and operating problems. To investigate these issues, our workshop uses the vacuum testing method demonstrated by Sonnax.

What does the vacuum test measure?

We apply vacuum at selected test points on the prepared valve body. The vacuum reading helps assess how well the valve seals within its bore. Under identical testing conditions, a lower reading may indicate greater internal leakage or wear.

Reliable comparisons require a clean, dry valve body, a proper seal and a calibrated test setup. We interpret the readings for the specific test point and equipment used.

Targeted fault diagnosis

The test helps identify worn valve-to-bore interfaces that cause internal leakage and supports decisions about the repair required.

Checking the repair

Repeating the test also helps evaluate the repair. The numerical readings can be compared under identical conditions.

Discuss your transmission diagnosis
Technical information and demonstration sources:Sonnax Vacuum Test Stand KitSonnax – Vacuum Testing for Leakage

02 / DOCUMENTED TRANSMISSION REBUILDING

ZF 6HP and ZF 8HPautomatic transmission rebuilding.

Based on ZF repair manuals. With documented measurements.

Six-In-Line Kft. rebuilds every type in the ZF 6HP and ZF 8HP transmission families. We work from repair manuals published by ZF. We carefully measure clutch clearances and adjust them to ZF specifications.

Itemised estimate and measurement report

The report also records clutch clearances measured before and after rebuilding. Precise adjustment can therefore be followed in figures.

Request a transmission rebuilding estimate
Clutch plates and internal components of a disassembled automatic transmission on the workbench.
Disassembly and component inspection
Dial indicator inspection of an automatic transmission internal assembly.
Dial indicator inspection

PRECISION CAN BE MEASURED

Measure. Adjust. Document.

Clutch clearance to ZF specifications is an important part of rebuilding. Our measurements are also recorded in the report.

Over 200,000 km

We know of several transmissions we previously rebuilt that went on to cover more than 200,000 kilometres after rebuilding.

Past experience; not a guaranteed mileage.

MANUFACTURER DOCUMENTATION

When is a transmission oil change due?

Earlier editions of ZF repair manuals also address oil change timing. The exact transmission type and the document edition both matter.

ZF 6HP28

160,000 km / 10 years

The earlier 6HP28 manual states that an oil change is not necessary before this mileage or age.

ZF 6HP28 Repair Manual · Version 07/12/01 · page iv

ZF 8HP45

80,000–120,000 km / 8 years

The earlier 8HP45 manual specifies the mileage interval according to operating conditions, or a period of 8 years.

ZF 8HP45 Repair Manual · Version 15/09/22 · page iv

ZF’s current TE-ML 11 guidance recommends changing the oil after 150,000 kilometres, or earlier with higher loads, high operating temperatures or unknown prior use. We discuss the right timing for your car based on transmission type, use and history.

ZF TE-ML 11 – manufacturer maintenance guidance (PDF)

WHAT TO KNOW BEFORE YOUR VISIT

Frequently asked questions about transmission service

What does vacuum testing of the valve body reveal?

Vacuum testing helps identify internal leakage caused by wear by assessing the sealing ability between valves and their bores. We use the method demonstrated by Sonnax, with a US-imported vacuum pump of the same type as the one in the demonstration. We interpret readings for the specific test point and calibrated setup. The method also supports checks after a repair; we discuss the appropriate inspection based on the transmission’s condition.

Does the transmission need an oil change or rebuilding?

The transmission’s condition determines this. We investigate jerking, slipping or delayed shifts using diagnostics and the available condition data. A transmission oil change does not replace repairs that are already needed; we discuss the appropriate work after inspection.

Which automatic transmissions do you rebuild?

We rebuild every type in the ZF 6HP and ZF 8HP transmission families. Preparation requires precise identification of the installed transmission, using vehicle details, the VIN and the transmission identification plate.

Which oil and parts do you use?

For 8 years, we have used exclusively ZF oils, filters and seals to service ZF transmissions. We select the oil and parts to the specifications for the particular transmission type.

What does the rebuilding documentation include?

We prepare an itemised estimate for rebuilding. The work is documented in a report that also records clutch clearances measured before and after rebuilding. We adjust them using repair manuals published by ZF.

How much does automatic transmission rebuilding cost?

The cost depends on the exact transmission type, its condition and the work required. When requesting an estimate, provide the vehicle model, year, mileage, VIN and fault symptoms. We prepare an itemised estimate for rebuilding.

When is a ZF transmission oil change due?

Transmission type, use and applicable manufacturer documentation all matter. Earlier 6HP28 and 8HP45 manuals give different mileage and age figures. ZF’s current TE-ML 11 guidance recommends an oil change after 150,000 kilometres, or earlier with higher loads or unknown prior use. Let’s discuss the details of your car.

Where is the workshop and how do I request an appointment?

The Six-In-Line workshop is in Őcsény, near Szekszárd: 7143 Őcsény, Soványtelek 000109/0032. You can request an appointment or estimate online, or call +36 70 529 7731. Appointments become final when confirmed by the workshop.

Automatic transmission service and rebuilding

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SIX-IN-LINE · ŐCSÉNY, NEAR SZEKSZÁRD

Let’s discusswhat your transmission needs.

Is an oil change due, or are you experiencing a transmission fault? Share your vehicle details and the work you need. We will get back to you to agree on the next step.

Request a quote Request an appointment
Talk to us by phone+36 70 529 7731
Workshop and directions7143 ŐcsénySoványtelek 000109/0032

Online appointments become final when confirmed by the workshop.