My Subaru was leaking oil due to a bad gasket and I only had 1L of the CORRECT top up oil (castrol edge 0w-40) available. I had to add additional 0.25L of different oil; castrol edge 5w-30 w/titanium to bring it up to level. I rathered more of wrong oil rather than driving with low oil to my mechanic. However when I got to my mechanic, he didn't have the right size gasket in stock. So I had to drive back home and drive back there again another day for oil change. So overall I drove about 150km with this mix of fluids. Does driving with 0.25L of wrong oil in your engine hurt anything? What if I drove a lot longer than 150km. Thanks
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