Will 5W20 Hurt a 5W30 Engine

Can You Use 5W20 Instead of 5W30? In most cases, using 5W20 instead of 5W30 will not immediately harm your engine, but it may affect performance, fuel economy, and long-term engine wear. The main difference between the two oils is that 5W20 is thinner at operating temperature, meaning it provides less protection under high heat…