I also changed the oil last weekend, putting in Valvoline VR1 with a Purolator filter. I realized afterwards that the bottles were synthetic. Should I drain the synthetic and put conventional back in the car?


The oil isn’t going to hurt anything.  Just wait for your next oil change. We use Shell Rotella 15/40 in all our vehicles. It was designed for diesels & contains some zinc, which offsets the lack of lead in today’s gasoline and it’s cheaper than VR1 or “Purple power”.