Can you use 10w 30 oil for sae 30 oil?

Yes, you can use 10W-30 oil in place of SAE 30 oil, as both are suitable for many engines. The "10W" indicates that the oil has a lower viscosity at cold temperatures, which can improve cold-start performance. However, SAE 30 is a single-grade oil, while 10W-30 is multi-grade, meaning it may perform better in a wider range of temperatures. Always check your engine manufacturer's recommendations before making a substitution.