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.
motor oil synthetic vs blend oil 101 full synthetic motor oil full synthetic motor oil contains base oil that is man made the synthesis processes through which the oil is made improve key performance attributes and enable improvements to wear protection extreme temperature performance and deposit controlart synthetic motor oil is designed to have some of the benefits of a full synthetic but at a lower cost the number of oems original equipment manufacturers whose specifications require the use of full synthetic or part synthetic engine oils began increasing several years ago