Here's a breakdown:
* Thinner Oil: 5W-20 is a thinner oil than 5W-30. This means it provides less protection against wear at higher temperatures and under heavy loads.
* Engine Design: If your car's engine is specifically designed for 5W-30, using 5W-20 could lead to increased engine wear over time. The clearances in the engine are engineered to work optimally with the specified viscosity. Thinner oil might not provide sufficient lubrication in those clearances, leading to increased friction and potential damage.
* Manufacturer's Recommendations: Always check your owner's manual. This is the definitive source for the correct oil viscosity for your vehicle. Ignoring the manufacturer's recommendations voids any warranty related to engine damage.
* Driving Conditions: If you primarily drive in moderate conditions, the consequences might be less severe than if you frequently drive aggressively or tow heavy loads. The thinner oil will be more prone to breakdown under stress.
In short: While a single instance might not cause immediate harm, consistently using 5W-20 when 5W-30 is specified can lead to premature engine wear and potential engine failure. It's best to stick to the manufacturer's recommended oil viscosity.
