Quote:
Originally Posted by MysteryTheatre
anyway getting back to the original subject of viscosity index (NOT VISCOSITY)
i am interested in any oils that have a viscosity index above 150 for a 10-40 or higher viscosity you can check what your oil is on the manufacturer's website
under the PDS . tell us what you use and what the viscosity index is the person with the highest number wins end of story. and by the way that penrite oil only has a viscosity index of 127 embarrassingly low, your lucky you even have cam lobes.
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Isn't it wonderful how people get fixated on one measure of oil.
If you actually checked their website you would have seen that the oil I use HPR15 has a viscosity index of 151. In the range that you want info on (10W/40) the viscosity index is 158 in their normal oil and 176 in their synthetic oil.
No wonder my engine doesn't wear.
Now put this one measure into context. The viscosity index is how much the oil thins when heated. It is more important with the tinner oils than the higher viscosity oils. So a 15w/60 oil can thin a lot more than a 10w/40 and still over greater shear protection.
Penrite's normal 5W/? oil has a viscosity index of 167 and their Synth is 186.
So based on your limited selection criteria, my oil beats what you require and I could go a lot higher on oil costing the same price as what I am using. But a thin oil that doesn't thin as quickly does not offer the same protection as the thicker oil.
