Can you use 5 w 30 instead of 5 w 20 oil?

Answer 1

Check the owner's manual, call the manufacturer or head to a oil lube shop and ask. Some makes and models, yes. It isn't a good idea to go with a heavier weight oil unless the manufacturer says it is acceptable. Sometimes the weight of the oil relates to the lowest weather temp the car will be exposed to, but sometimes an engine is not designed to handle another weight.