1992 BMW 325i Q&A

1992 BMW 325i Question: How to add engine oil--where????

I am taking care of a friends 1992 325i. Engine oil light came on-I-opened the hood--I see a dip stick with red handle and then a large turn cap that has a dip stick on it that sits slightly below the engine but I do not see a label on either of these...both are located on the drivers side of the engine..don't want to add oil to the wrong place. -
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