Hi everyone
My brother-in-law has an old BMW 3 series (don't know the exact model and year) with leaking collant. He bought a colling system tester adapter to test on his car. Unfortunately, he could not do it because for some reasons. He wants to borrow my X5 to test to see is the tester working or not? How does this work? and is it safe to let him use my X5 to test the equipment? Thanks everyone

ALX5