The 2017 GLA is a compact Mercedes crossover (X156 generation facelift year) — petrol automatics are common and often paired with Mercedes’ 7-speed automatic systems and small turbocharged engines. These petrol engines reward regular oil changes and proper servicing; turbo and transmission work is more expensive than mainstream brands, and 4MATIC AWD versions add drivetrain complexity so confirm if the car is AWD and that associated service work has been done.

• Automatic gearbox behaviour: test for smooth shifts, delayed engagement or jerky up/down changes and check for transmission fluid leaks from cooler lines.
• Turbo performance and smoke: full-throttle run to check for blue/grey smoke, whistling or poor boost response indicating turbo wear or oil issues.
• Listen for timing-chain/tensioner noise at cold start (rattles) which can signal future engine work on some Mercedes petrol engines.
• If fitted with 4MATIC, verify AWD operation and listen for centre-diff or rear-axle noises; check CV joints for clicking under lock.
• Suspension and tyres: drive over bumps to reveal clunks or sagging, and check for uneven tyre wear which can indicate worn bushes/arms or tracking issues.