Yes, you can even mix them together with no problems.
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.
Yes, you can mix them.
The engine uses 5W30. It can be synthetic or conventional.The engine uses 5W30. It can be synthetic or conventional.
Yes, without any issues. That's what synthetic blend oils are (better than conventional oil, not quite as good as pure synthetic).
Yes, you can mix them.
Oil changes are always necessary. If you mean can you mix conventional oil and synthetic, the answer is yes you can.
No, I would not recommend using synthetic in an engine this old. Use a good 10w40 conventional oil.
No it is fine to switch back to regular oil.
Change the oil and filter every 5,000 miles if you are using conventional oil or every 7,500 miles if you are using synthetic oil.
conventional. I wouldn't put synethic in it unless it has already had it in the engine. Synthetic is mostly used in high performance or new vehicles. Synthetic won't do anything for an older engine
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.