I see a puddle under my car in the morning — how urgent is this?

It depends on the fluid. Oil and coolant leaks: inspect within a few days. Brake fluid: same day — do not drive until inspected. Fuel: do not drive — call us immediately.

My car smells of burning oil but I cannot see a leak — why?

Small leaks from valve cover gaskets or the cam chain area can drip onto the exhaust manifold and burn off before reaching the floor. The burning smell appears but no puddle forms. We locate these with UV dye.

How long does a valve cover gasket replacement take?

1–3 hours depending on the engine. Engines with complex intake manifold arrangements (BMW S58, Porsche flat-six) take longer due to access requirements.

Leaks

Oil, coolant, brake fluid or fuel leaks are safety-critical faults. We identify the source of any fluid leak with pressure testing and inspect all seals, gaskets and lines.

DIAGNOSE LEAK

Fluid Identification

Fluid type (oil, coolant, brake fluid, transmission fluid, fuel) identified by colour, consistency and location to direct diagnosis.
Pressure & UV Dye Test

Cooling system pressure-tested. UV dye injected into oil or AC circuits to reveal hairline cracks and seeping gaskets under UV light.
Seal & Gasket Replacement

Valve cover gasket, sump gasket, rear main seal, coolant hose, and all related seals replaced with OEM-specification parts.

Any fluid leak — oil, coolant, brake fluid, transmission fluid, power steering fluid or fuel — is a fault that should not be delayed. Hallmark technicians use pressure testing, dye tracing and visual inspection to locate and repair all leak sources.

HOW DIAGNOSIS IS PERFORMED?

Leak Identification

Vehicle inspected under lift. Fluid type confirmed. UV light used to trace leak path back to source on oiled components.
Pressure Test

Cooling or fuel system pressure-tested to OEM specification to confirm and locate slow leaks not visible at rest.
Repair

Identified seal, gasket, hose or joint replaced. Mating surfaces cleaned and inspected. OEM torque figures applied.
Post-Repair Check

System refilled and re-pressurised. Vehicle operated to working temperature. Leak point confirmed dry before handover.

Frequently Asked Questions About Leaks

: It depends on the fluid. Oil and coolant leaks: inspect within a few days. Brake fluid: same day — do not drive until inspected. Fuel: do not drive — call us immediately.
: Small leaks from valve cover gaskets or the cam chain area can drip onto the exhaust manifold and burn off before reaching the floor. The burning smell appears but no puddle forms. We locate these with UV dye.
: 1–3 hours depending on the engine. Engines with complex intake manifold arrangements (BMW S58, Porsche flat-six) take longer due to access requirements.

Brands We Serve

Audi

Audi petrol and diesel engines, DSG transmission, quattro drivetrain and MMI infotainment serviced with VCDS and OEM-level diagnostic tools.
Bentley

Bentley Continental, Flying Spur, and Bentayga serviced with factory-level tooling. W12, V8 and V6 hybrid engines, ZF 8-speed transmission, and all-wheel drive systems.
BMW

BMW petrol and diesel engines, xDrive, M-sport and M models serviced with ISTA diagnostic tools. N20, N55, B58, S58, M57 and S63 engine specialists.
Bugatti

Bugatti Veyron and Chiron serviced under strict manufacturer protocols. W16 engine, DSG sequential gearbox, and active aerodynamics specialist.
Ferrari

Ferrari V8, V10 and V12 naturally aspirated and turbocharged engines serviced. F-type transmission, E-diff and adaptive suspension diagnostics.
Jaguar

Jaguar F-Pace, F-Type, XE, XF and XJ serviced with Jaguar SDD diagnostic software. Ingenium petrol and diesel engines, ZF transmission and air suspension.
Lamborghini

Lamborghini Huracán and Urus serviced with factory-level diagnostic tools. V10, V8 twin-turbo, and e-Hybrid powertrain specialists.
Land Rover

Land Rover Discovery, Defender, Range Rover and Range Rover Sport serviced with Jaguar Land Rover SDD. Air suspension, Terrain Response, and Ingenium engine specialists.
Maserati

Maserati Ghibli, Levante, GranTurismo and Quattroporte serviced. Ferrari-derived V6 and V8 engines, ZF transmission and active suspension diagnostics.
McLaren

McLaren 570S, 720S, GT and Artura serviced with McLaren STAR diagnostic tools. 3.8 and 4.0 twin-turbo V8, and P1 / Artura hybrid powertrains.
Mercedes-Benz

Mercedes-Benz C-Class to S-Class, GLE, AMG and EQ serviced with XENTRY diagnostic tools. OM diesel, M petrol, AMG V8 and EQ electric powertrain specialists.
Porsche

Porsche 911, Cayenne, Macan, Panamera and Taycan serviced with PIWIS diagnostic tools. Boxer, V6, V8 and electric drive specialists.
Rolls-Royce

Rolls-Royce Ghost, Phantom, Cullinan and Wraith serviced to Rolls-Royce factory specification. BMW-Group N74 V12, ZF transmission and Magic Carpet Ride air suspension specialists.