Of course you can! It is an old wive's tale that you cannot change back and forth. One real concern is a very high mileage car that has used conventional oil going to synthetic. In that case,the synthetic oil might dissolve too much gunk, so it is recommended that you make the transition with 2 oil changes at 2K miles each so as to flush out the gunk. But that is not your case. You will just need more frequent oil changes at 5K miles instead of 10K miles. Make sure you use the same weight oil as recommended by the manufacturer.
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