I've always changed the oil in my mom's 2013 Chev Spark myself but got sick of it. The filter is a PITA!!!. So this place near me has 5W20 which is what the car requires and it's the Valvoline Blend but they tried to tell me I have to use Dexos full syn or it could create engine damage. I called BS and wasnt going to spend 70.00 for a change so I made them use the regular 5W20. I will say the ownersmanual says to use demos, but is this really going to be an issue?