Coolant Leak w/ 2018 BMW 540i

Location: La Mesa, CA

Duration: A few days

Cost: $1,800 – $2,300

Company: Euro Auto Tech & Smog

Project Overview:

At Euro Auto Tech & Smog, we addressed a persistent coolant leak on a 2018 BMW 540i. After performing a pressure test, our technicians quickly identified a few common failure points in the cooling and oil systems of this B-series engine.

Key Findings & Repairs:

• Coolant reservoir had a micro-crack, leaking under pressure
• Lower reservoir hose was worn and compromised
• Oil filter housing was also leaking — a known issue on these engines

Despite the coolant being low, the vehicle was otherwise in excellent condition: clean, stock, and free of rust or signs of neglect.

Services Performed:

• Replaced the oil filter housing
• Installed a new coolant reservoir, overflow hose, and lower coolant pipe
• Topped off with fresh coolant
• Completed with a full synthetic oil change