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.
Synthetic Blend Motor Oil. Synthetic oil costs more than conventional oil, which is why Jiffy Lube Â® also offers synthetic blend. As the name suggests, synthetic blend is simply a mixture or blend of synthetic and conventional motor oils. Both its price and protection levels are in between conventional and full synthetic oil. (Often synthetic oil is referred to as âfull syntheticâ to distinguish it from a synthetic blend.) So you can think of conventional, synthetic blend and full synthetic oil as good, better, best.