There is nothing wrong with putting oil on the hair during the day in Ramadaan

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Check below answers in case you are looking for other related questions:
Is it permissible to fast with the intention of drawing closer to Allah and earning reward, and with the intention of losing weight?
Rinsing the mouth with salt and water whilst fasting

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Related Answers:
Visiting graveyards when fasting
Gathering to break the fast together
Ruling on husband and wife playing while fasting
Is it permissible to fast with the intention of drawing closer to Allah and earning reward, and with the intention of losing weight?
Rinsing the mouth with salt and water whilst fasting

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