Quote:
Originally Posted by DrinkenBRZ
Don’t forget to account for shearing of the oil in use from fuel and mechanical. You can estimate safety at 18-22% operating and half that for HTHS or use a voa and uoas to see how it’s holding up. From what I’ve seen most of the shearing is done before 1000 miles in use.
I too agree that a functional HTHS (after shearing of the oil) is fine for track days with a cooler or with stock power in this application.
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Before synthetic oil, I used to use Castrol almost exclusively because it was more resistant to shear. At least I bought into the sales pitch and the hype. What I know about synthetic oils is that they are very resistant to shearing and provide reliable lubrication for longer intervals under high load. Something about all the molecules being more uniform in size (smaller) and having stronger bonds. I heard that from someone who claims that he is not on the payroll for the company that makes that claim. I still trust what he says in spite of the fact that he does get free stuff on occasion.