Rear Main Seal Replacement – Mercedes ML350 BlueTEC AMG

– Mercedes ML350 BlueTEC AMG

If your ML350 is leaking oil at the junction between engine and transmission, it’s often due to a worn rear crankshaft seal (also known as the rear main seal). Catching it early reduces the risk of bigger, costlier issues.

Why this matters

You might think a drip’s no big deal, but letting this oil leak continue really ramps up the risk: low engine oil pressure, internal wear, and even transmission damage if oil contaminates the housing.

Spotting a failing seal

Common signs include:

• Drips or oil puddles under the bell housing

• Oil smoke or smell from the engine bay

• Consistently low oil despite top-ups

Why that cost might feel high—psychology of decisions

1. Upfront saving feels smart, but delays risk bigger bills later.

2. Proactive fixes save stress: tackling problems before they worsen is reassuring.

3. Indie workshops offer trusted value: owners report significant savings over dealers.

4. One-and-done convenience: while the gearbox is out, you could fix related oil cooler or transmission seals—saving time and hassle later.

What you can do

• Budget for £800–£1,200 with a reliable independent specialist.

• Ask about seal upgrade options—Viton-style seals are more durable.

• Get a fixed quote including gearbox removal and any extra seals.

• Plan related repairs now—the oil cooler, gearbox seals, clutch components—can all be done in the same session.

Final thought

Yes, the front-end cost can sting. But thinking ahead—fixing the rear main seal before scarring your engine or transmission—brings real peace of mind. Spending a bit now saves a lot later.