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Bob, my question is the characteristics of the multi viscosity oil. My understanding is the chemical additive to the oil will change the viscosity as temperature increases. Also this chemical will break down as it is used repeatedly. In this case taking a 0 weight oil to a 20 weight. But as noted, with 8K usage, the chemical break down could effectively be leaving the oil weight at a lower weight than the designed target of 20 weight when at operating temperature.
How are you taking this into effect? Are you measuring the viscosity of the oil at temp? Is the difference really a viscosity comparison of less than 20 to 30 weight? That would not be giving the additive a chance, would it?
This is great information as I'll be applying your findings to my oil choices, no doubt.
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