It is genetic - in my family there is no history of it as it is a recessive gene but my mum and dad were both carriers. In Scotland up to 13% of the population has red hair, but around 40% of the population is thought to carry the recessive gene responsible for the world's rarest natural hair colour.
On the other hand, synthetic base oil molecules are chemically controlled, which provides increased ï¬ lm strength and lubricity over petroleum oils. The performance qualities of base oils have a marked impact on the performance qualities of the ï¬ nished product.
    Conventional motor oils are made from crude oil which has been is pumped from the ground and then processed in a refinery to create a base oil. Additives are then mixed into the base oil to change the viscosity, protection properties and heat breakdown levels of the oil.    Synthetic oil is also created in a similar manner to a conventional engine oil, using a base oil combined with a series of additives.ifference in a motor and an engineA motor uses an exterior power  source to do the work. An engine creates its own power to do the  work.   Answer   The original an â¦ swer is incorrect, as both an engine and a motor  require an external source of energy to operate.