Question: are sae 30 and 10w30 the same?
Answer: SAE 10W30 is an oil that has SAE 10W viscosity(thickness) at low temperatures, and SAE 30 viscosity at high temperatures. The W stands for 'Winter'. ... At operating temperature, there'll likely be little difference between SAE 30 and SAE 10W30. In theory, they're the same at high temperature, which is IIRC set at 100C.