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Guys, I have made a stupid error by pouring about 1/2 litre of transmission (Castrol ATF Dex II) oil in with my engine oil ( Shell Helix 5w/40). I have a 2003 Ford Escape. What should I do? Is it necessary to completely drain the oil and start fresh? Or given the small ratio of Transmission oil to Engine oil would it be safe to drive? Your informative responses would greatly appreciated. Regards, Shane C.