Yes, you can even mix synthetic with conventional oil.
I will change my oil from conventional oil to synthetic oil on my next oil change.
Oil changes are always necessary. If you mean can you mix conventional oil and synthetic, the answer is yes you can.
It can be. The 5w20 is the weight of the oil which you can buy conventional or synthetic. If it is synthetic it will say so right on the container. If it does not say synthetic it is conventional oil.
Yes you can change to conventional oil.
No it is fine to switch back to regular oil.
Every 5k with conventional oil. Every 10k with synthetic oil.
It is a combination of synthetic oil and conventional oil.
Yes, you can even mix them together with no problems.
It is conventional oil and contains no synthetic oil. 3000 & 5000 are part synthetic and part conventional. 7000 is a full synthetic oil.
You can use conventional or synthetic any major brand first oil change. Change the oil at the mileage specified in your owners manual.
Yes, service stations will often call this a semi sythetic oil change.
Yes you can.