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Always check dip stick when engine oil is at operating temp. If for some reason you have to add oil to a cold engine, put it half way between the add mark and the full mark. There is a big difference between coolant temperature and oil temperature for it to fully expand. If you are fortuate engough to have a oil temp gauge pay attention to that. When the oil temperatue is a operating temperatue that is when you can safely top off.
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