At Ulu Otomotiv in the Ümraniye Kadosan Auto Industrial Estate, we provide model-specific scheduled maintenance and fault diagnosis for W204 and W205 chassis Mercedes C-Class vehicles. Using computerized diagnostics, we measure and resolve the chronic issues of OM651 diesel and M274 petrol engines, 7G-Tronic/9G-Tronic transmission service, and steering rack faults. As an independent service, we deliver workmanship to brand standards using genuine or quality equivalent parts, with no unnecessary parts replacement and guaranteed labor.
Because the W204 and W205 generations of the Mercedes C-Class come with different engine and transmission setups, their maintenance is not one-size-fits-all; we handle every vehicle according to its chassis and engine code. On OM651 diesel engines we include injector, timing chain, and oil leak inspection in standard maintenance, while on M274 petrol engines we track the chain tensioner and oil consumption. We never neglect the oil and filter renewal interval on 7G-Tronic and 9G-Tronic automatic transmissions, and we assess electromechanical steering rack warnings using live data. With computerized diagnostics we read the fault records and pinpoint the true source of the problem by measurement rather than guesswork, clearly reporting every operation performed and every part used.
If you notice any of the symptoms below, a prompt expert inspection is important.
On OM651 and M274 engines, a rattle on the first start-up is a sign of timing chain stretch or a weakened chain tensioner; if left too long, timing slippage can cause serious engine damage.
On the OM651 diesel, fatigued injector seals lead to fuel leaks and carbon buildup; a rough idle and slow throttle response are early warnings of this injector problem.
On the OM651, the oil cooler gasket beneath the turbo and the injector area can leak; drips on your parking spot can be caught early to prevent major repairs.
On the W204/W205, when the electromechanical steering rack fails the steering becomes heavy and a warning appears on the instrument cluster; we confirm this with live data and resolve it without unnecessary replacement.
On the 7G-Tronic and 9G-Tronic, when the oil and filter interval is missed you feel jolting, delay, or shock during gear changes; timely oil service extends transmission life.
On diesel models, when the DPF, EGR or AdBlue system reports a fault the check engine light comes on; we get these systems working again using legal cleaning and repair methods, without removing them.
From appointment to delivery, we run every step transparently and to plan.
Book via phone, WhatsApp or the web and tell us your complaint.
We take in your car and run a visual and device-based pre-check.
We pinpoint the root cause and define what needs to be done.
We share the details and start only after your approval.
We test after the work and hand your car back safely.
An honest, solution-focused service experience you can trust your car with.
We share every step and get your approval.
Same-day appointment and quick turnaround.
All work performed is under warranty.
Certified and experienced technicians.
The main points we carefully inspect as part of the service.
We follow the same meticulous approach on every job.
Not trial and error, but precise diagnosis based on measurement and data.
Professional, clean workmanship with the right equipment and experience.
Safe delivery with post-service testing and inspection.
A selection of real customer experiences.
“There was a slight rattle from the engine on cold starts, and another shop had told me 'the engine needs to be opened up.' Ulu Otomotiv hooked it up to the machine, showed me the timing chain stretch, told me there was no need to panic, and did the chain service with a genuine part. A team in Ümraniye that truly knows the C-Class and doesn't sell you parts you don't need.”
“I had oil consumption and a rough idle. It was clear they knew the M274 engine well; they measured the oil consumption and checked the chain tensioner and the intake side. They reported every single operation one by one. I come from Kadıköy, but I couldn't find this kind of trust at any other shop.”
“The transmission on my 9-year-old W204 was jolting during gear changes. They did the 7G-Tronic oil and filter change to the correct specification and also found and fixed an injector leak. They work far more transparently and based on measurement than the shop in Çekmeköy, and they guaranteed the labor.”
Quick answers to your questions.
Other solutions you may need for your vehicle.
Contact our expert team for maintenance, fault diagnosis and repair. Leave your car in safe hands.
