Spark ignition gasoline and compression ignition diesel engines differ in how they supply and ignite the fuel. In a spark ignition engine, the fuel is mixed with air and then inducted into the cylinder during the intake process. After the piston compresses the fuel-air mixture, the spark ignites it, causing combustion.
1 If your skin is too sensitive, dilute tea tree oil with some baby shampoo. Add 10-20 drops of tea tree oil to 1/2 cup of baby shampoo. Use this daily to wash your scalp and hair till you get rid of itchy scalp.  You can even massage diluted tea tree oil to your scalp.
Amla moisturizes the scalp to help control dandruff and other issues related to the scalp. You can also use amla powder in several ways to make nourishing hair packs, as follows: STRENGTHENING PACK: Make a paste with 2 teaspoons of amla powder and warm water. To this paste, add yoghurt and honey. Apply this paste evenly on your scalp and hair strands. Allow it to stay for about 30 minutes before you rinse it off completely.