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.
The difference between synthetic motor oils and conventional or regular motor oils is that the synthetic oils are injected and blended with artificial chemical compounds that were not present in the natural crude oil; this synthesizing creates a uniform weight and size of the molecules in the oil.ubricant, synthetic motor oils are blended to prevent the build up of sludge, even under the worst engine conditions.