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.
Thereâs a lot to consider. Find out about the differences between synthetic vs. conventional motor oils. Find answers to your Mobil 1 product questions and more. Use the product selector for oil and filter recommendations for your car or truck. Filter recommendations appear to the right of your oil results.