Originally Posted By: Vladiator
Just goes to show that mixing oils of different manufacturers and different viscosities won't hurt your engine with normal OCIs.
Not even slightly. It shows you can get a VOA done on a mixture of oils.
If you run it and have no detectable adverse effects, it STILL won't show the above, because (a) there may be undetected effects, and (b) you may not have hit on one of the combinations that produce adverse effects.
IF adverse effects are relatively rare and proportional to the amount of the negatively interacting components, both of which seem reasonable speculations, I'd further speculate that with so many components you'll have (a) increased the chance of getting them (good "experimentally") but reduced the chance of detecting them (bad "experimentally"), due to dilution.
Experimenting can be fun. I'd say this one is likely to be rather difficult to interpret, and I wonder if a Range Rover Sport might be rather too big a Guinea Pig.