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Another issue you need to be aware of is that modern engine oil is not just oil - oils use many and varied additives to achieve specific ends. Detergents are used to remove contaminants from engine components but there are many other additives that help maintain viscosity over the life of the oil, and yet others that help the oil deal with extreme heat and/or cold and lots of other things.
When you mix different brands of oil or even different types of oil from the same manufacturer you risk the various additives working against each other and the oil delivering less than optimal protection.
The science behind modern lubes is almost "rocket science" and unless you really know what you are doing I think it's better to follow the expert's recommendations.