Coolant and turbo oil line leaks in the hot vee (N63, 2020 to 2023 cars)
The N63's turbochargers sit inside the V of the engine, and years of heat harden the hoses, seals and lines around them. Slow coolant loss is reported from about 50,000 miles and oil seeping from the turbo feed and return lines from about 70,000; a hose or seal is a modest bill, but lines deep in the vee take hours of labor.
How to check
Look for low-coolant warnings in the history, dried coolant or wet oil at the top and back of the engine, and a coolant or hot-oil smell after a drive, and ask which hoses, seals or lines have been replaced.
