Originally Posted by mcdansley
What is the difference between SAE 0W30 vs. SAE 30 motor oil for 4-cycle engines? Are they the same? The SAE 0W30 is a full synthetic made by Mobil. Is it safe to run in lawn mower engines in the place of SAE 30? It is rated SL.
NO they are NOT the same!
SAE 0w30 is a multi-grade oil whose viscosity ranges between 0 and 30.
SAE 30 is a single grade oil whose viscosity is a stable 30.
As for me, I run 10w30 synth.blend in my Kohlers, 10w40 synth.blend in the briggs, and 5w30 synth.blend in the bmw's.