Cracked Sump Repair on an MG ZS: How We Fixed the Leak

When an MG ZS recently rolled into the Romano’s Automotive workshop, the diagnosis was clear before the bonnet was even up 🔧. A cracked sump was leaving a trail of oil behind it, and the owner had wisely decided enough was enough. Cracked or damaged sumps are more common than most drivers realise, and left unchecked, they can lead to catastrophic engine damage. Here’s how we tackled the job and why it matters for anyone noticing mystery puddles under their vehicle.

What Causes a Cracked Sump?

The sump (or oil pan) sits at the lowest point of the engine, making it vulnerable to impact from road debris, speed humps, kerbs, and uneven driveways. On vehicles like the MG ZS, ground clearance isn’t generous, so even a modest knock can result in a hairline crack or a full fracture. Over time, corrosion and worn sump plug threads can also compromise the seal.

Common warning signs include:

• Oil spots forming under the car when parked
• A burning oil smell after driving
• Low oil level warnings on the dash
• Visible oil residue around the underside of the engine

Our Diagnosis and Repair Process

With the MG ZS up on the hoist, we carried out a full inspection to confirm the source of the leak. It’s important to rule out other culprits, such as rocker cover gaskets, rear main seals, or oil cooler lines, before committing to a sump repair. Once the cracked sump was confirmed, we drained the oil, removed the damaged component, cleaned the mating surfaces thoroughly, and fitted a replacement with a fresh gasket and new sump plug. After refilling with the correct grade of oil, we ran the engine, checked for leaks under pressure, and road tested to confirm everything was sealed and running as it should.

Why Timely Repairs Matter

Driving with a cracked sump is risky business. Oil starvation can destroy bearings, camshafts and ultimately the engine itself, turning a manageable repair into a five-figure rebuild. Catching leaks early is the single best way to protect your vehicle’s longevity.

Book Your MG or Euro In With the Perth Specialists

If you’ve noticed oil stains on your driveway or suspect a leak, don’t wait for the damage to escalate. Romano’s Automotive in Perth specialises in MG, European and performance vehicles, offering accurate diagnostics and workshop-quality repairs without the guesswork. Book your vehicle in today at our online booking page or give the team a call on 0401 747 320 or 0483 932 306. We’ll have you back on the road, leak-free and running properly.