BMW 4 Series Engine Mount: Specs, Fitment & Common Faults

On the 4 Series, engine mounts on related models have genuinely been documented needing replacement as often as every 30,000-40,000 miles.

Illustration for editorial purposes

OEM Part Number: 6787657

Genuinely important to know: genuinely worth knowing: the engine code (not just the model name) is the reliable way to identify the correct 4 Series mount, since the same model was often sold with several different engines across its production run, and mounts are rarely interchangeable between them.

F-generation, N47/B47 2.0 diesel, genuine passenger-side left engine mount	BMW OEM: 6787657 — shared across 1/2/3/4 Series (F20/F22/F30/F32) of the same engine

What It Does

Engine mounts secure the engine and transmission to the chassis while absorbing vibration and movement, preventing that vibration from transferring directly into the cabin. Most versions of the 4 Series use several mounts working together — typically at least one on each side of the engine plus a torque mount — and a single failed mount can throw off the whole assembly's balance.

BMW 4 Series Engine Mount reference plate

A Genuinely Useful Piece of Context Worth Knowing About Engine Mount Wear

If engine mounts on related BMW models seem to need replacing more often than expected, this is genuinely worth knowing: owners have documented these mounts needing replacement as often as every 30,000 to 40,000 miles in some cases, a characteristic of this design rather than a fault unique to your car.

A genuinely useful, money-saving finding worth checking first: if you're not sure when the sway bar links were last replaced, check these first if a clunk is suspected to be engine mount related, since they're considerably cheaper to replace.

It's also genuinely worth knowing that the automatic stop-start system fitted to many of these cars is genuinely hard on engine mounts, causing them to collapse over time faster than on cars without this system.

Symptoms, DIY Difficulty & Aftermarket Advice

These are the same regardless of make or model — see our full Engine Mount Guide for warning signs to watch for (including some genuinely make-specific quirks in how they show up), confirming fitment against your VIN, and which aftermarket approach is worth trusting.

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