When it comes to adding oil to your engine, vehicle manufacturers set specific recommendations for optimal performance. Given the choice of alternatives:
1. SAE 100W-30
2. SAE 5W-50
3. SAE 20W-30
4. SAE 10W-30
We know that SAE 5W-30 is a recommended oil viscosity grade. Among the alternatives listed, the one that is commonly recommended by vehicle manufacturers as an alternative to SAE 5W-30 is SAE 10W-30.
So, the correct alternative to SAE 5W-30 is:
SAE 10W-30