You can mix part synthetic oil with full synthetic oil.
Yes, that is what a synthetic blend is that they sell.
Yes you can mix different brands but I recommend you do not mix different weights. You can even mix synthetic oil with conventional oil. But as the weight of the oil is critical, do not ever mix one weight of oil with another, no matter if it is synthetic or conventional oil.
Yes, you can. It is even sold as a Synthetic Blend.
Yes.
the oil mix is 32 to 1 or 50 to 1 for synthetic oil the oil mix is 32 to 1 or 50 to 1 for synthetic oil
Yes, semi synthetic is a blend of synthetic and conventional oil already.
Synthetic and conventional oil can be mixed and used with no problem. That is exactly what a synthetic blend that you can buy is. A mix of synthetic oil and conventional.
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Yes, of course you can. You can even mix synthetic with conventional oil.
Yes, you can also mix it with conventional oil creating a blend.
Yes, you can even mix synthetic with conventional oil.