For those that may be reading this thread for some info on oil, rather than the entertainment, there is an easy way to tell how high the Viscosity Index is, without looking up data sheets. Simly look at the viscosity range of the oil. The larger the gap between the upper and lower figures, the higher the index. As this is what the index means. That is, how well it maintains is viscosity under heat.
So my oil is a 15w/60, a lot broader range than your cheaper 20w/50 oils. Penrites Synthetic oils are 5W/60, which is a huge range for such a light weight oil and that is why it has such a high index. Even their 10w mineral oil is a 10W/50, not 10w/40 recommended by others on this thread. That is why you will not find a 10W/40 with a high index as a high index would most likely make it a 10w/50.
So back to my original comments. Don't worry about all the technology, just stick with a good reputable brand that meets current standards. To some degree you get what you pay for, but this does not mean that you have to go overboard and buy the most expensive. I run full synthetic in my motorcycle, as the technology requires it, your old lump of a Rover V8 does not. Due to what I put my motor through, I do run a Synthetic blend, but it is still half the price of full synthetic.
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