No you can out a hot oil treatment on before or after a
conditioner
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Yes, it can be harmful. Use no oil treatment or stop leak at
all.
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No, it is not advisable to use hot oil on your hair after the
keratin treatment.
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Yes, if you are referring to Lucas oil. But if you are referring
to Lucas Oil Treatment the answer is no. Do not add any oil
treatment to your engine period.
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No, oil treatment will react in the same way as regular oil.
Replace the valve seals.