Yes of course you can mix them what what would be the reason to do so.
There should be no problem with mixing them.
Yes
Yes, you can mix conventional oil with synthetic oil with no problem.
Yes, you can mix weights but use exactly what the manufacture recommends and do not mix weights.
not recommended
Yes, as long as the ambient temperature is above fifty degrees.
Yes, you can
Mixing synthetic with semi-cynthetic or even conventional will cause no harm at all. Mixing weight will give you another weight based on the mix. If you mixed 2 quarts of 5w30 with 2 quarts of 10w40 you will theoretically have a weight of 7.5w35.
semi feodal, semi market and partly government manipulated economy. Its a mix.
Yes, semi synthetic is a blend of synthetic and conventional oil already.
thses 2 can be mixed, but to what reason do you want to mix them. if you are going to mix these and use them in a vehicle you are going to blow smoke from burning oil in deisel, or trash engine from using diluted oil in engine go to www.bluegrassfuel.net , they have all the info one would need to use motor oil as fuel.
Yes, it is actually sold that way. It is called semi synthetic.Yes, it is actually sold that way. It is called semi synthetic.