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.
4 Facts About the Difference Between Synthetic Oil & Regular Oil. Is synthetic oil really necessary, or is it just an upgrade? These are common questions we hear from drivers who come in for an oil service and wonder if thereâs really a difference between synthetic oil and conventional oil. Even though synthetic oil has been recommended by many vehicle manufacturers for more than a decade, a lot of drivers donât know much about it.