Is it safe to drive with Mercedes C220 CDI OM651 injector seal leak — fuel in oil?

Drive with caution to the nearest garage. Avoid motorway speeds until the fault is diagnosed.

What is the most common fix for Mercedes C220 CDI OM651 injector seal leak — fuel in oil?

Fuel injector cleaning or replacement

How much does it cost to fix Mercedes C220 CDI OM651 injector seal leak — fuel in oil?

Based on driver reports, repair costs typically range from $200 to $1200. Costs vary by make, model and location.

🟢 Mercedes C220 CDI OM651 injector seal leak — fuel in oil

Mercedes-Benz C-Class 2011

Safe to Drive?

⚠️ Drive with Caution

Urgency Level

🟢 Low Priority

Diesel fuel smell from the engine oil dipstick and fuel level dropping faster than expected. The copper sealing washers on the OM651 diesel injectors harden with heat cycling and allow diesel fuel to leak past the injector body into the crankcase. This dilutes the engine oil and can cause accelerated bearing wear. All four injector copper washers must be replaced simultaneously. Do not reuse old copper washers.