If you ever top up your engine fluids oil or engine coolant at your regular fuel pump & there's a good quantity left in the can & the attendant offers to keep the half filled can in your trunk then please ensure that they have shut the cap or lid tight because the oil may spill all over the car leading to a hazardous situation & lot of wastage also. This has happened so consistently in so many cases & people tend to forget about it but can be risky.