This is not recommended, sometimes it is necessary for some reason to instantly fill the tank. It is a good idea to use an oil with the same level of quality as the one that is currently being used in the vehicle and, if possible, from the same manufacturer. Additionally, during the next oil change, it is a good idea to replace the oil filter with a new one.
Tip 1: Mineral base oils and synthetic oils are different, they are not miscible.
Tip 2: When two lubricants are mixed, it results in a variation of the geniune performance of each product, generally to a lower level.
Thank you for reading.
