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The short is answer yes but it is not encouraged. By changing the oil and not the oil filter will allow unfiltered oil to be ran back through your engine. This unfiltered oil can be full of contaminants such as dirt and other particles. This might lead to a decrease in your vehicle's engine life. So therefore it is highly encouraged to change the oil filter when changing the oil.

Synthetic oil works better in extreme temperatures, have ssuperior lubrication which creates less sludge, and needs to be changed less often. Conventional oil is your regular motor oil and typically costs about half of what synthetic does and needs to be changed more frquently. If you drive a performance vehicle, tow, or haul often you might want to consider using synthetic.

You have the option to choose between synthetic, synthetic blend, or conventional oil. As far as which grade of oil to use you can find the answer in your owner's manual or it will usually be printed on your oil cap.