Got a call recently to book in one of the Uber workhorses for its Major Service. These 320d’s rack up serious mileage every month, so as soon as the parts arrived, the driver dropped the car off and we got straight to work.
We started with the usual:
✅ Added Motul Engine Flush and let it idle for the recommended time.
✅ Raised the vehicle and pulled the drain plug for a full drain.
✅ While the oil drained, we did our standard undercarriage inspection—checking suspension, drivetrain, and engine bay.
Two issues caught our attention:
🔸 The diff housing was greasy—signaling a potential leak.
🔸 The serpentine belt showed noticeable wear.
We made a note and sent pictures to the owner for review.
The Major Service continued:
🔹 Replaced crush washer and refitted drain plug.
🔹 Removed and replaced the fuel filter with a new Bosch unit.
🔹 Lowered the car, removed the oil filter, cleaned the housing & cap, and installed a new Mahle filter.
🔹 Replaced the dirty engine air filter with a Bosch filter (after blowing out the airbox with compressed air to remove any dust and debris).
🔹 Filled up with Motul XClean 5w40 oil.
🔹 Swapped the cabin filter for a MANN activated carbon unit.
🔹 Topped up washer fluid with Motul Vision Expert Ultra.
At this point, we removed the under tray also noticed pieces of the serpentine belt sitting there. 📸 Took more pictures and sent them to the owner.
After a quick call, we agreed on the following:
✅ Order and fit a new belt & correct tensioner (suspecting the current one was incorrect for the B47 engine).
✅ Replace the diff oil with fresh Motul oil and clean the housing to monitor the leak going forward. He will decide how to proceed from there.
When the parts arrived, we:
🔹 Removed the old belt and tensioner and compared them side-by-side to confirm the tensioner fitted previously by another person or shop was incorrect (the roller was narrower than the belt).
🔹 Installed the correct parts and cleaned up the engine bay.
On to the diff:
🔸 Degreased and scrubbed the housing clean.
🔸 Drained the old, filthy oil and filled up with fresh Motul Gear Oil.
🔸 Cleaned around the fill plug for easy monitoring of future leaks.
Before handing the car back, we:
🔹 Ran diagnostics and cleared all fault codes.
🔹 Reset the CBS oil service reminder.
🔹 Hung up an MMS branded air freshener in the cabin.
Driver collected it and was back on the road, ready to pick up passengers again.
We started with the usual:
✅ Added Motul Engine Flush and let it idle for the recommended time.
✅ Raised the vehicle and pulled the drain plug for a full drain.
✅ While the oil drained, we did our standard undercarriage inspection—checking suspension, drivetrain, and engine bay.
Two issues caught our attention:
🔸 The diff housing was greasy—signaling a potential leak.
🔸 The serpentine belt showed noticeable wear.
We made a note and sent pictures to the owner for review.
The Major Service continued:
🔹 Replaced crush washer and refitted drain plug.
🔹 Removed and replaced the fuel filter with a new Bosch unit.
🔹 Lowered the car, removed the oil filter, cleaned the housing & cap, and installed a new Mahle filter.
🔹 Replaced the dirty engine air filter with a Bosch filter (after blowing out the airbox with compressed air to remove any dust and debris).
🔹 Filled up with Motul XClean 5w40 oil.
🔹 Swapped the cabin filter for a MANN activated carbon unit.
🔹 Topped up washer fluid with Motul Vision Expert Ultra.
At this point, we removed the under tray also noticed pieces of the serpentine belt sitting there. 📸 Took more pictures and sent them to the owner.
After a quick call, we agreed on the following:
✅ Order and fit a new belt & correct tensioner (suspecting the current one was incorrect for the B47 engine).
✅ Replace the diff oil with fresh Motul oil and clean the housing to monitor the leak going forward. He will decide how to proceed from there.
When the parts arrived, we:
🔹 Removed the old belt and tensioner and compared them side-by-side to confirm the tensioner fitted previously by another person or shop was incorrect (the roller was narrower than the belt).
🔹 Installed the correct parts and cleaned up the engine bay.
On to the diff:
🔸 Degreased and scrubbed the housing clean.
🔸 Drained the old, filthy oil and filled up with fresh Motul Gear Oil.
🔸 Cleaned around the fill plug for easy monitoring of future leaks.
Before handing the car back, we:
🔹 Ran diagnostics and cleared all fault codes.
🔹 Reset the CBS oil service reminder.
🔹 Hung up an MMS branded air freshener in the cabin.
Driver collected it and was back on the road, ready to pick up passengers again.
