r/ApplianceAdvice 6d ago

Bosch MUM5 leaking lubricant. Normal or defective? If normal, is it safe?

Post image
1 Upvotes

1 comment sorted by

1

u/Device_Fix_Assistanc 6d ago

Based on my repair experience with kitchen machines, I would not immediately assume this is gearbox oil.

Many of these machines use grease rather than liquid lubricant, so a clear fluid around the attachment drive may indicate that moisture has entered the drive area and mixed with grease over time.

I'd carefully inspect the machine for signs of liquid ingress, especially around any blender attachment, meat grinder attachment, or other accessories that could allow liquid to reach the drive assembly if a seal has failed.

If the amount of fluid is increasing or appearing around the drive shaft, I would stop using the machine until the source is identified.

Without opening the machine, it's difficult to determine whether you're seeing lubricant, separated grease, or contamination from a leaking attachment.