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Yes, semi synthetic is a blend of synthetic and conventional oil already.
Yes you can. However, I do not see a reason to do that.
Yes, many believe that you can not mix any oil blend together. This is not true, full synthetic can be mixed with conventional also with no harm. If this is done, there is just wasted cash when buying the synthetic.
10-40 semi synthetic or 15-40 mineral oil
Yes, it is actually sold that way. It is called semi synthetic.Yes, it is actually sold that way. It is called semi synthetic.
YES! "Regular" oil is what is mixed with synthetic to make semi-synthetic. Try to use the same brand. I've heard it's not good to mix the different additives that different companies use.
Basically no Adding mineral to synthetic oils destroys the characteristics of the oil. Adding synthetic to mineral is waste of the more expensive synthetic oil with the same results as above. If you have to mix in emergency, get a complete oil change ASAP. You can use either mineral or synthetic oil for the same application but not mixed. Synthetic oils in cars is now used as it gives longer service intervals- typically 12 months or 12,000 - 20,000 miles. Mineral oils break down quicker and require changing more frequently 6 months or 6,000 - 10,000 miles
Semi synthetic or synthetic blend is a combination of synthetic and conventional oil. Full synthetic oil is just that 100% synthetic oil.
Yes, service stations will often call this a semi sythetic oil change.
You can mix part synthetic oil with full synthetic oil.
Yes, they can be mixed.
Yes, service stations will often call this a semi sythetic oil change.